diff --git a/docker-compose.yml b/docker-compose.yml
index 79fcfb69b0..2368377b86 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -286,6 +286,7 @@ services:
       - CART_SERVICE_ADDR
       - CHECKOUT_SERVICE_ADDR
       - CURRENCY_SERVICE_ADDR
+      - FEATURE_FLAG_GRPC_SERVICE_ADDR
       - PRODUCT_CATALOG_SERVICE_ADDR
       - RECOMMENDATION_SERVICE_ADDR
       - SHIPPING_SERVICE_ADDR
diff --git a/pb/demo.proto b/pb/demo.proto
index aed0c2ce8b..76ce899e65 100644
--- a/pb/demo.proto
+++ b/pb/demo.proto
@@ -266,46 +266,52 @@ message Ad {
 service FeatureFlagService {
   rpc GetFlag(GetFlagRequest) returns (GetFlagResponse) {}
   rpc CreateFlag(CreateFlagRequest) returns (CreateFlagResponse) {}
-  rpc UpdateFlag(UpdateFlagRequest) returns (UpdateFlagResponse) {}
+  rpc UpdateFlagProbability(UpdateFlagProbabilityRequest) returns (UpdateFlagProbabilityResponse) {}
   rpc ListFlags(ListFlagsRequest) returns (ListFlagsResponse) {}
   rpc DeleteFlag(DeleteFlagRequest) returns (DeleteFlagResponse) {}
 }
 
-message Flag {
+message FlagEvaluationResult {
   string name = 1;
   string description = 2;
   bool enabled = 3;
 }
 
+message FlagDefinition {
+  string name = 1;
+  string description = 2;
+  float enabled = 3;
+}
+
 message GetFlagRequest {
   string name = 1;
 }
 
 message GetFlagResponse {
-  Flag flag = 1;
+  FlagEvaluationResult flag = 1;
 }
 
 message CreateFlagRequest {
   string name = 1;
   string description = 2;
-  bool enabled = 3;
+  float enabled = 3;
 }
 
 message CreateFlagResponse {
-  Flag flag = 1;
+  FlagDefinition flag = 1;
 }
 
-message UpdateFlagRequest {
+message UpdateFlagProbabilityRequest {
   string name = 1;
-  bool enabled = 2;
+  float enabled = 2;
 }
 
-message UpdateFlagResponse {}
+message UpdateFlagProbabilityResponse {}
 
 message ListFlagsRequest {}
 
 message ListFlagsResponse {
-  repeated Flag flag = 1;
+  repeated FlagDefinition flag = 1;
 }
 
 message DeleteFlagRequest {
diff --git a/regenerate-grpc-code.sh b/regenerate-grpc-code.sh
new file mode 100755
index 0000000000..c50eb78b59
--- /dev/null
+++ b/regenerate-grpc-code.sh
@@ -0,0 +1,92 @@
+#!/bin/sh
+
+set -euo pipefail
+
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+
+# This script is used to update generated code after changing demo.proto.
+
+cd -P -- "$(dirname -- "$0")"
+pwd
+
+command -v npm >/dev/null 2>&1 || {
+  cat <<EOF >&2
+npm needs to be installed but it isn't.
+
+Aborting.
+EOF
+  exit 1
+}
+
+command -v go >/dev/null 2>&1 || {
+  cat <<EOF >&2
+go needs to be installed but it isn't.
+
+Aborting.
+EOF
+  exit 1
+}
+
+command -v rebar3 >/dev/null 2>&1 || {
+  cat <<EOF >&2
+rebar3 needs to be installed but it isn't.
+
+Aborting.
+EOF
+  exit 1
+}
+
+
+command -v protoc >/dev/null 2>&1 || {
+  cat <<EOF >&2
+protoc needs to be installed but it isn't.
+
+Aborting.
+EOF
+  exit 1
+}
+
+echo "Regenerating typescript code in src/frontend based on demo.proto"
+pushd src/frontend > /dev/null
+# The npm script grpc:generate expects the pb directory to be available in the current directory (src/frontend) because it is
+# intended to be used during Docker build, where pb is copied to the same working directory as src/frontend. To get around that
+# difference, we temporarily create a symlink to pb and then remove it after the script is done.
+ln -s ../../pb pb
+npm run grpc:generate
+rm pb
+popd > /dev/null
+
+echo "Regenerating Go code in src/accountingservice based on demo.proto"
+pushd src/accountingservice > /dev/null
+go generate
+popd > /dev/null
+
+echo "Regenerating Go code in src/checkoutservice based on demo.proto"
+pushd src/checkoutservice > /dev/null
+go generate
+popd > /dev/null
+
+echo "Regenerating Go code in src/productcatalogservice based on demo.proto"
+pushd src/productcatalogservice > /dev/null
+go generate
+popd > /dev/null
+
+echo "Regenerating Java code in src/adservice based on demo.proto"
+pushd src/adservice > /dev/null
+./gradlew  generateProto
+popd > /dev/null
+
+echo "Recompiling Erlang code in src/featureflagservice based on demo.proto"
+pushd src/featureflagservice > /dev/null
+# The Erlang build expects the proto file to be available in src/featureflagservice/proto) because it is
+# intended to be used during Docker build, where demo.proto is copied to the the proto directory in the same working directory
+# as the Erlang source code. To get around that difference, we temporarily create a symlink to ../../pb as proto and then remove
+# it after the script is done.
+ln -s ../../pb proto
+rebar3 grpc_regen
+rm proto
+popd > /dev/null
+
+
+echo done
\ No newline at end of file
diff --git a/restart-service.sh b/restart-service.sh
index 5f80919dbe..365edad3a8 100755
--- a/restart-service.sh
+++ b/restart-service.sh
@@ -1,4 +1,7 @@
 #!/bin/sh
+
+set -euo pipefail
+
 # Copyright The OpenTelemetry Authors
 # SPDX-License-Identifier: Apache-2.0
 
diff --git a/src/accountingservice/genproto/oteldemo/demo.pb.go b/src/accountingservice/genproto/oteldemo/demo.pb.go
index a788255384..d441e2da55 100644
--- a/src/accountingservice/genproto/oteldemo/demo.pb.go
+++ b/src/accountingservice/genproto/oteldemo/demo.pb.go
@@ -15,7 +15,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.32.0
-// 	protoc        v4.25.1
+// 	protoc        v4.25.2
 // source: demo.proto
 
 package oteldemo
@@ -1810,7 +1810,7 @@ func (x *Ad) GetText() string {
 	return ""
 }
 
-type Flag struct {
+type FlagEvaluationResult struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
@@ -1820,8 +1820,8 @@ type Flag struct {
 	Enabled     bool   `protobuf:"varint,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
 }
 
-func (x *Flag) Reset() {
-	*x = Flag{}
+func (x *FlagEvaluationResult) Reset() {
+	*x = FlagEvaluationResult{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_demo_proto_msgTypes[32]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1829,13 +1829,13 @@ func (x *Flag) Reset() {
 	}
 }
 
-func (x *Flag) String() string {
+func (x *FlagEvaluationResult) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*Flag) ProtoMessage() {}
+func (*FlagEvaluationResult) ProtoMessage() {}
 
-func (x *Flag) ProtoReflect() protoreflect.Message {
+func (x *FlagEvaluationResult) ProtoReflect() protoreflect.Message {
 	mi := &file_demo_proto_msgTypes[32]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1847,32 +1847,95 @@ func (x *Flag) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use Flag.ProtoReflect.Descriptor instead.
-func (*Flag) Descriptor() ([]byte, []int) {
+// Deprecated: Use FlagEvaluationResult.ProtoReflect.Descriptor instead.
+func (*FlagEvaluationResult) Descriptor() ([]byte, []int) {
 	return file_demo_proto_rawDescGZIP(), []int{32}
 }
 
-func (x *Flag) GetName() string {
+func (x *FlagEvaluationResult) GetName() string {
 	if x != nil {
 		return x.Name
 	}
 	return ""
 }
 
-func (x *Flag) GetDescription() string {
+func (x *FlagEvaluationResult) GetDescription() string {
 	if x != nil {
 		return x.Description
 	}
 	return ""
 }
 
-func (x *Flag) GetEnabled() bool {
+func (x *FlagEvaluationResult) GetEnabled() bool {
 	if x != nil {
 		return x.Enabled
 	}
 	return false
 }
 
+type FlagDefinition struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name        string  `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Description string  `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
+	Enabled     float32 `protobuf:"fixed32,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
+}
+
+func (x *FlagDefinition) Reset() {
+	*x = FlagDefinition{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_demo_proto_msgTypes[33]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FlagDefinition) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FlagDefinition) ProtoMessage() {}
+
+func (x *FlagDefinition) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[33]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FlagDefinition.ProtoReflect.Descriptor instead.
+func (*FlagDefinition) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{33}
+}
+
+func (x *FlagDefinition) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *FlagDefinition) GetDescription() string {
+	if x != nil {
+		return x.Description
+	}
+	return ""
+}
+
+func (x *FlagDefinition) GetEnabled() float32 {
+	if x != nil {
+		return x.Enabled
+	}
+	return 0
+}
+
 type GetFlagRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1884,7 +1947,7 @@ type GetFlagRequest struct {
 func (x *GetFlagRequest) Reset() {
 	*x = GetFlagRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[33]
+		mi := &file_demo_proto_msgTypes[34]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1897,7 +1960,7 @@ func (x *GetFlagRequest) String() string {
 func (*GetFlagRequest) ProtoMessage() {}
 
 func (x *GetFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[33]
+	mi := &file_demo_proto_msgTypes[34]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1910,7 +1973,7 @@ func (x *GetFlagRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetFlagRequest.ProtoReflect.Descriptor instead.
 func (*GetFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{33}
+	return file_demo_proto_rawDescGZIP(), []int{34}
 }
 
 func (x *GetFlagRequest) GetName() string {
@@ -1925,13 +1988,13 @@ type GetFlagResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Flag *Flag `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
+	Flag *FlagEvaluationResult `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
 }
 
 func (x *GetFlagResponse) Reset() {
 	*x = GetFlagResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[34]
+		mi := &file_demo_proto_msgTypes[35]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1944,7 +2007,7 @@ func (x *GetFlagResponse) String() string {
 func (*GetFlagResponse) ProtoMessage() {}
 
 func (x *GetFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[34]
+	mi := &file_demo_proto_msgTypes[35]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1957,10 +2020,10 @@ func (x *GetFlagResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetFlagResponse.ProtoReflect.Descriptor instead.
 func (*GetFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{34}
+	return file_demo_proto_rawDescGZIP(), []int{35}
 }
 
-func (x *GetFlagResponse) GetFlag() *Flag {
+func (x *GetFlagResponse) GetFlag() *FlagEvaluationResult {
 	if x != nil {
 		return x.Flag
 	}
@@ -1972,15 +2035,15 @@ type CreateFlagRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Name        string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	Description string `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
-	Enabled     bool   `protobuf:"varint,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	Name        string  `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Description string  `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
+	Enabled     float32 `protobuf:"fixed32,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
 }
 
 func (x *CreateFlagRequest) Reset() {
 	*x = CreateFlagRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[35]
+		mi := &file_demo_proto_msgTypes[36]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1993,7 +2056,7 @@ func (x *CreateFlagRequest) String() string {
 func (*CreateFlagRequest) ProtoMessage() {}
 
 func (x *CreateFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[35]
+	mi := &file_demo_proto_msgTypes[36]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2006,7 +2069,7 @@ func (x *CreateFlagRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CreateFlagRequest.ProtoReflect.Descriptor instead.
 func (*CreateFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{35}
+	return file_demo_proto_rawDescGZIP(), []int{36}
 }
 
 func (x *CreateFlagRequest) GetName() string {
@@ -2023,11 +2086,11 @@ func (x *CreateFlagRequest) GetDescription() string {
 	return ""
 }
 
-func (x *CreateFlagRequest) GetEnabled() bool {
+func (x *CreateFlagRequest) GetEnabled() float32 {
 	if x != nil {
 		return x.Enabled
 	}
-	return false
+	return 0
 }
 
 type CreateFlagResponse struct {
@@ -2035,13 +2098,13 @@ type CreateFlagResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Flag *Flag `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
+	Flag *FlagDefinition `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
 }
 
 func (x *CreateFlagResponse) Reset() {
 	*x = CreateFlagResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[36]
+		mi := &file_demo_proto_msgTypes[37]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2054,7 +2117,7 @@ func (x *CreateFlagResponse) String() string {
 func (*CreateFlagResponse) ProtoMessage() {}
 
 func (x *CreateFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[36]
+	mi := &file_demo_proto_msgTypes[37]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2067,42 +2130,42 @@ func (x *CreateFlagResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CreateFlagResponse.ProtoReflect.Descriptor instead.
 func (*CreateFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{36}
+	return file_demo_proto_rawDescGZIP(), []int{37}
 }
 
-func (x *CreateFlagResponse) GetFlag() *Flag {
+func (x *CreateFlagResponse) GetFlag() *FlagDefinition {
 	if x != nil {
 		return x.Flag
 	}
 	return nil
 }
 
-type UpdateFlagRequest struct {
+type UpdateFlagProbabilityRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Name    string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	Enabled bool   `protobuf:"varint,2,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	Name    string  `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Enabled float32 `protobuf:"fixed32,2,opt,name=enabled,proto3" json:"enabled,omitempty"`
 }
 
-func (x *UpdateFlagRequest) Reset() {
-	*x = UpdateFlagRequest{}
+func (x *UpdateFlagProbabilityRequest) Reset() {
+	*x = UpdateFlagProbabilityRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[37]
+		mi := &file_demo_proto_msgTypes[38]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *UpdateFlagRequest) String() string {
+func (x *UpdateFlagProbabilityRequest) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*UpdateFlagRequest) ProtoMessage() {}
+func (*UpdateFlagProbabilityRequest) ProtoMessage() {}
 
-func (x *UpdateFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[37]
+func (x *UpdateFlagProbabilityRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[38]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2113,48 +2176,48 @@ func (x *UpdateFlagRequest) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use UpdateFlagRequest.ProtoReflect.Descriptor instead.
-func (*UpdateFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{37}
+// Deprecated: Use UpdateFlagProbabilityRequest.ProtoReflect.Descriptor instead.
+func (*UpdateFlagProbabilityRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{38}
 }
 
-func (x *UpdateFlagRequest) GetName() string {
+func (x *UpdateFlagProbabilityRequest) GetName() string {
 	if x != nil {
 		return x.Name
 	}
 	return ""
 }
 
-func (x *UpdateFlagRequest) GetEnabled() bool {
+func (x *UpdateFlagProbabilityRequest) GetEnabled() float32 {
 	if x != nil {
 		return x.Enabled
 	}
-	return false
+	return 0
 }
 
-type UpdateFlagResponse struct {
+type UpdateFlagProbabilityResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 }
 
-func (x *UpdateFlagResponse) Reset() {
-	*x = UpdateFlagResponse{}
+func (x *UpdateFlagProbabilityResponse) Reset() {
+	*x = UpdateFlagProbabilityResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[38]
+		mi := &file_demo_proto_msgTypes[39]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *UpdateFlagResponse) String() string {
+func (x *UpdateFlagProbabilityResponse) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*UpdateFlagResponse) ProtoMessage() {}
+func (*UpdateFlagProbabilityResponse) ProtoMessage() {}
 
-func (x *UpdateFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[38]
+func (x *UpdateFlagProbabilityResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[39]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2165,9 +2228,9 @@ func (x *UpdateFlagResponse) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use UpdateFlagResponse.ProtoReflect.Descriptor instead.
-func (*UpdateFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{38}
+// Deprecated: Use UpdateFlagProbabilityResponse.ProtoReflect.Descriptor instead.
+func (*UpdateFlagProbabilityResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{39}
 }
 
 type ListFlagsRequest struct {
@@ -2179,7 +2242,7 @@ type ListFlagsRequest struct {
 func (x *ListFlagsRequest) Reset() {
 	*x = ListFlagsRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[39]
+		mi := &file_demo_proto_msgTypes[40]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2192,7 +2255,7 @@ func (x *ListFlagsRequest) String() string {
 func (*ListFlagsRequest) ProtoMessage() {}
 
 func (x *ListFlagsRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[39]
+	mi := &file_demo_proto_msgTypes[40]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2205,7 +2268,7 @@ func (x *ListFlagsRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListFlagsRequest.ProtoReflect.Descriptor instead.
 func (*ListFlagsRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{39}
+	return file_demo_proto_rawDescGZIP(), []int{40}
 }
 
 type ListFlagsResponse struct {
@@ -2213,13 +2276,13 @@ type ListFlagsResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Flag []*Flag `protobuf:"bytes,1,rep,name=flag,proto3" json:"flag,omitempty"`
+	Flag []*FlagDefinition `protobuf:"bytes,1,rep,name=flag,proto3" json:"flag,omitempty"`
 }
 
 func (x *ListFlagsResponse) Reset() {
 	*x = ListFlagsResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[40]
+		mi := &file_demo_proto_msgTypes[41]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2232,7 +2295,7 @@ func (x *ListFlagsResponse) String() string {
 func (*ListFlagsResponse) ProtoMessage() {}
 
 func (x *ListFlagsResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[40]
+	mi := &file_demo_proto_msgTypes[41]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2245,10 +2308,10 @@ func (x *ListFlagsResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListFlagsResponse.ProtoReflect.Descriptor instead.
 func (*ListFlagsResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{40}
+	return file_demo_proto_rawDescGZIP(), []int{41}
 }
 
-func (x *ListFlagsResponse) GetFlag() []*Flag {
+func (x *ListFlagsResponse) GetFlag() []*FlagDefinition {
 	if x != nil {
 		return x.Flag
 	}
@@ -2266,7 +2329,7 @@ type DeleteFlagRequest struct {
 func (x *DeleteFlagRequest) Reset() {
 	*x = DeleteFlagRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[41]
+		mi := &file_demo_proto_msgTypes[42]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2279,7 +2342,7 @@ func (x *DeleteFlagRequest) String() string {
 func (*DeleteFlagRequest) ProtoMessage() {}
 
 func (x *DeleteFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[41]
+	mi := &file_demo_proto_msgTypes[42]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2292,7 +2355,7 @@ func (x *DeleteFlagRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DeleteFlagRequest.ProtoReflect.Descriptor instead.
 func (*DeleteFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{41}
+	return file_demo_proto_rawDescGZIP(), []int{42}
 }
 
 func (x *DeleteFlagRequest) GetName() string {
@@ -2311,7 +2374,7 @@ type DeleteFlagResponse struct {
 func (x *DeleteFlagResponse) Reset() {
 	*x = DeleteFlagResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[42]
+		mi := &file_demo_proto_msgTypes[43]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2324,7 +2387,7 @@ func (x *DeleteFlagResponse) String() string {
 func (*DeleteFlagResponse) ProtoMessage() {}
 
 func (x *DeleteFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[42]
+	mi := &file_demo_proto_msgTypes[43]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2337,7 +2400,7 @@ func (x *DeleteFlagResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DeleteFlagResponse.ProtoReflect.Descriptor instead.
 func (*DeleteFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{42}
+	return file_demo_proto_rawDescGZIP(), []int{43}
 }
 
 var File_demo_proto protoreflect.FileDescriptor
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 }
 
 var (
@@ -2679,7 +2755,7 @@ func file_demo_proto_rawDescGZIP() []byte {
 	return file_demo_proto_rawDescData
 }
 
-var file_demo_proto_msgTypes = make([]protoimpl.MessageInfo, 43)
+var file_demo_proto_msgTypes = make([]protoimpl.MessageInfo, 44)
 var file_demo_proto_goTypes = []interface{}{
 	(*CartItem)(nil),                       // 0: oteldemo.CartItem
 	(*AddItemRequest)(nil),                 // 1: oteldemo.AddItemRequest
@@ -2713,17 +2789,18 @@ var file_demo_proto_goTypes = []interface{}{
 	(*AdRequest)(nil),                      // 29: oteldemo.AdRequest
 	(*AdResponse)(nil),                     // 30: oteldemo.AdResponse
 	(*Ad)(nil),                             // 31: oteldemo.Ad
-	(*Flag)(nil),                           // 32: oteldemo.Flag
-	(*GetFlagRequest)(nil),                 // 33: oteldemo.GetFlagRequest
-	(*GetFlagResponse)(nil),                // 34: oteldemo.GetFlagResponse
-	(*CreateFlagRequest)(nil),              // 35: oteldemo.CreateFlagRequest
-	(*CreateFlagResponse)(nil),             // 36: oteldemo.CreateFlagResponse
-	(*UpdateFlagRequest)(nil),              // 37: oteldemo.UpdateFlagRequest
-	(*UpdateFlagResponse)(nil),             // 38: oteldemo.UpdateFlagResponse
-	(*ListFlagsRequest)(nil),               // 39: oteldemo.ListFlagsRequest
-	(*ListFlagsResponse)(nil),              // 40: oteldemo.ListFlagsResponse
-	(*DeleteFlagRequest)(nil),              // 41: oteldemo.DeleteFlagRequest
-	(*DeleteFlagResponse)(nil),             // 42: oteldemo.DeleteFlagResponse
+	(*FlagEvaluationResult)(nil),           // 32: oteldemo.FlagEvaluationResult
+	(*FlagDefinition)(nil),                 // 33: oteldemo.FlagDefinition
+	(*GetFlagRequest)(nil),                 // 34: oteldemo.GetFlagRequest
+	(*GetFlagResponse)(nil),                // 35: oteldemo.GetFlagResponse
+	(*CreateFlagRequest)(nil),              // 36: oteldemo.CreateFlagRequest
+	(*CreateFlagResponse)(nil),             // 37: oteldemo.CreateFlagResponse
+	(*UpdateFlagProbabilityRequest)(nil),   // 38: oteldemo.UpdateFlagProbabilityRequest
+	(*UpdateFlagProbabilityResponse)(nil),  // 39: oteldemo.UpdateFlagProbabilityResponse
+	(*ListFlagsRequest)(nil),               // 40: oteldemo.ListFlagsRequest
+	(*ListFlagsResponse)(nil),              // 41: oteldemo.ListFlagsResponse
+	(*DeleteFlagRequest)(nil),              // 42: oteldemo.DeleteFlagRequest
+	(*DeleteFlagResponse)(nil),             // 43: oteldemo.DeleteFlagResponse
 }
 var file_demo_proto_depIdxs = []int32{
 	0,  // 0: oteldemo.AddItemRequest.item:type_name -> oteldemo.CartItem
@@ -2749,9 +2826,9 @@ var file_demo_proto_depIdxs = []int32{
 	21, // 20: oteldemo.PlaceOrderRequest.credit_card:type_name -> oteldemo.CreditCardInfo
 	25, // 21: oteldemo.PlaceOrderResponse.order:type_name -> oteldemo.OrderResult
 	31, // 22: oteldemo.AdResponse.ads:type_name -> oteldemo.Ad
-	32, // 23: oteldemo.GetFlagResponse.flag:type_name -> oteldemo.Flag
-	32, // 24: oteldemo.CreateFlagResponse.flag:type_name -> oteldemo.Flag
-	32, // 25: oteldemo.ListFlagsResponse.flag:type_name -> oteldemo.Flag
+	32, // 23: oteldemo.GetFlagResponse.flag:type_name -> oteldemo.FlagEvaluationResult
+	33, // 24: oteldemo.CreateFlagResponse.flag:type_name -> oteldemo.FlagDefinition
+	33, // 25: oteldemo.ListFlagsResponse.flag:type_name -> oteldemo.FlagDefinition
 	1,  // 26: oteldemo.CartService.AddItem:input_type -> oteldemo.AddItemRequest
 	3,  // 27: oteldemo.CartService.GetCart:input_type -> oteldemo.GetCartRequest
 	2,  // 28: oteldemo.CartService.EmptyCart:input_type -> oteldemo.EmptyCartRequest
@@ -2767,11 +2844,11 @@ var file_demo_proto_depIdxs = []int32{
 	26, // 38: oteldemo.EmailService.SendOrderConfirmation:input_type -> oteldemo.SendOrderConfirmationRequest
 	27, // 39: oteldemo.CheckoutService.PlaceOrder:input_type -> oteldemo.PlaceOrderRequest
 	29, // 40: oteldemo.AdService.GetAds:input_type -> oteldemo.AdRequest
-	33, // 41: oteldemo.FeatureFlagService.GetFlag:input_type -> oteldemo.GetFlagRequest
-	35, // 42: oteldemo.FeatureFlagService.CreateFlag:input_type -> oteldemo.CreateFlagRequest
-	37, // 43: oteldemo.FeatureFlagService.UpdateFlag:input_type -> oteldemo.UpdateFlagRequest
-	39, // 44: oteldemo.FeatureFlagService.ListFlags:input_type -> oteldemo.ListFlagsRequest
-	41, // 45: oteldemo.FeatureFlagService.DeleteFlag:input_type -> oteldemo.DeleteFlagRequest
+	34, // 41: oteldemo.FeatureFlagService.GetFlag:input_type -> oteldemo.GetFlagRequest
+	36, // 42: oteldemo.FeatureFlagService.CreateFlag:input_type -> oteldemo.CreateFlagRequest
+	38, // 43: oteldemo.FeatureFlagService.UpdateFlagProbability:input_type -> oteldemo.UpdateFlagProbabilityRequest
+	40, // 44: oteldemo.FeatureFlagService.ListFlags:input_type -> oteldemo.ListFlagsRequest
+	42, // 45: oteldemo.FeatureFlagService.DeleteFlag:input_type -> oteldemo.DeleteFlagRequest
 	5,  // 46: oteldemo.CartService.AddItem:output_type -> oteldemo.Empty
 	4,  // 47: oteldemo.CartService.GetCart:output_type -> oteldemo.Cart
 	5,  // 48: oteldemo.CartService.EmptyCart:output_type -> oteldemo.Empty
@@ -2787,11 +2864,11 @@ var file_demo_proto_depIdxs = []int32{
 	5,  // 58: oteldemo.EmailService.SendOrderConfirmation:output_type -> oteldemo.Empty
 	28, // 59: oteldemo.CheckoutService.PlaceOrder:output_type -> oteldemo.PlaceOrderResponse
 	30, // 60: oteldemo.AdService.GetAds:output_type -> oteldemo.AdResponse
-	34, // 61: oteldemo.FeatureFlagService.GetFlag:output_type -> oteldemo.GetFlagResponse
-	36, // 62: oteldemo.FeatureFlagService.CreateFlag:output_type -> oteldemo.CreateFlagResponse
-	38, // 63: oteldemo.FeatureFlagService.UpdateFlag:output_type -> oteldemo.UpdateFlagResponse
-	40, // 64: oteldemo.FeatureFlagService.ListFlags:output_type -> oteldemo.ListFlagsResponse
-	42, // 65: oteldemo.FeatureFlagService.DeleteFlag:output_type -> oteldemo.DeleteFlagResponse
+	35, // 61: oteldemo.FeatureFlagService.GetFlag:output_type -> oteldemo.GetFlagResponse
+	37, // 62: oteldemo.FeatureFlagService.CreateFlag:output_type -> oteldemo.CreateFlagResponse
+	39, // 63: oteldemo.FeatureFlagService.UpdateFlagProbability:output_type -> oteldemo.UpdateFlagProbabilityResponse
+	41, // 64: oteldemo.FeatureFlagService.ListFlags:output_type -> oteldemo.ListFlagsResponse
+	43, // 65: oteldemo.FeatureFlagService.DeleteFlag:output_type -> oteldemo.DeleteFlagResponse
 	46, // [46:66] is the sub-list for method output_type
 	26, // [26:46] is the sub-list for method input_type
 	26, // [26:26] is the sub-list for extension type_name
@@ -3190,7 +3267,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[32].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Flag); i {
+			switch v := v.(*FlagEvaluationResult); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3202,7 +3279,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[33].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetFlagRequest); i {
+			switch v := v.(*FlagDefinition); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3214,7 +3291,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[34].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetFlagResponse); i {
+			switch v := v.(*GetFlagRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3226,7 +3303,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[35].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CreateFlagRequest); i {
+			switch v := v.(*GetFlagResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3238,7 +3315,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[36].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CreateFlagResponse); i {
+			switch v := v.(*CreateFlagRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3250,7 +3327,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[37].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*UpdateFlagRequest); i {
+			switch v := v.(*CreateFlagResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3262,7 +3339,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[38].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*UpdateFlagResponse); i {
+			switch v := v.(*UpdateFlagProbabilityRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3274,7 +3351,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[39].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListFlagsRequest); i {
+			switch v := v.(*UpdateFlagProbabilityResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3286,7 +3363,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[40].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListFlagsResponse); i {
+			switch v := v.(*ListFlagsRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3298,7 +3375,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[41].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*DeleteFlagRequest); i {
+			switch v := v.(*ListFlagsResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3310,6 +3387,18 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[42].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DeleteFlagRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_demo_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*DeleteFlagResponse); i {
 			case 0:
 				return &v.state
@@ -3328,7 +3417,7 @@ func file_demo_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_demo_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   43,
+			NumMessages:   44,
 			NumExtensions: 0,
 			NumServices:   10,
 		},
diff --git a/src/accountingservice/genproto/oteldemo/demo_grpc.pb.go b/src/accountingservice/genproto/oteldemo/demo_grpc.pb.go
index 2002dfbcdc..184b7696d3 100644
--- a/src/accountingservice/genproto/oteldemo/demo_grpc.pb.go
+++ b/src/accountingservice/genproto/oteldemo/demo_grpc.pb.go
@@ -15,7 +15,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.3.0
-// - protoc             v4.25.1
+// - protoc             v4.25.2
 // source: demo.proto
 
 package oteldemo
@@ -1065,11 +1065,11 @@ var AdService_ServiceDesc = grpc.ServiceDesc{
 }
 
 const (
-	FeatureFlagService_GetFlag_FullMethodName    = "/oteldemo.FeatureFlagService/GetFlag"
-	FeatureFlagService_CreateFlag_FullMethodName = "/oteldemo.FeatureFlagService/CreateFlag"
-	FeatureFlagService_UpdateFlag_FullMethodName = "/oteldemo.FeatureFlagService/UpdateFlag"
-	FeatureFlagService_ListFlags_FullMethodName  = "/oteldemo.FeatureFlagService/ListFlags"
-	FeatureFlagService_DeleteFlag_FullMethodName = "/oteldemo.FeatureFlagService/DeleteFlag"
+	FeatureFlagService_GetFlag_FullMethodName               = "/oteldemo.FeatureFlagService/GetFlag"
+	FeatureFlagService_CreateFlag_FullMethodName            = "/oteldemo.FeatureFlagService/CreateFlag"
+	FeatureFlagService_UpdateFlagProbability_FullMethodName = "/oteldemo.FeatureFlagService/UpdateFlagProbability"
+	FeatureFlagService_ListFlags_FullMethodName             = "/oteldemo.FeatureFlagService/ListFlags"
+	FeatureFlagService_DeleteFlag_FullMethodName            = "/oteldemo.FeatureFlagService/DeleteFlag"
 )
 
 // FeatureFlagServiceClient is the client API for FeatureFlagService service.
@@ -1078,7 +1078,7 @@ const (
 type FeatureFlagServiceClient interface {
 	GetFlag(ctx context.Context, in *GetFlagRequest, opts ...grpc.CallOption) (*GetFlagResponse, error)
 	CreateFlag(ctx context.Context, in *CreateFlagRequest, opts ...grpc.CallOption) (*CreateFlagResponse, error)
-	UpdateFlag(ctx context.Context, in *UpdateFlagRequest, opts ...grpc.CallOption) (*UpdateFlagResponse, error)
+	UpdateFlagProbability(ctx context.Context, in *UpdateFlagProbabilityRequest, opts ...grpc.CallOption) (*UpdateFlagProbabilityResponse, error)
 	ListFlags(ctx context.Context, in *ListFlagsRequest, opts ...grpc.CallOption) (*ListFlagsResponse, error)
 	DeleteFlag(ctx context.Context, in *DeleteFlagRequest, opts ...grpc.CallOption) (*DeleteFlagResponse, error)
 }
@@ -1109,9 +1109,9 @@ func (c *featureFlagServiceClient) CreateFlag(ctx context.Context, in *CreateFla
 	return out, nil
 }
 
-func (c *featureFlagServiceClient) UpdateFlag(ctx context.Context, in *UpdateFlagRequest, opts ...grpc.CallOption) (*UpdateFlagResponse, error) {
-	out := new(UpdateFlagResponse)
-	err := c.cc.Invoke(ctx, FeatureFlagService_UpdateFlag_FullMethodName, in, out, opts...)
+func (c *featureFlagServiceClient) UpdateFlagProbability(ctx context.Context, in *UpdateFlagProbabilityRequest, opts ...grpc.CallOption) (*UpdateFlagProbabilityResponse, error) {
+	out := new(UpdateFlagProbabilityResponse)
+	err := c.cc.Invoke(ctx, FeatureFlagService_UpdateFlagProbability_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -1142,7 +1142,7 @@ func (c *featureFlagServiceClient) DeleteFlag(ctx context.Context, in *DeleteFla
 type FeatureFlagServiceServer interface {
 	GetFlag(context.Context, *GetFlagRequest) (*GetFlagResponse, error)
 	CreateFlag(context.Context, *CreateFlagRequest) (*CreateFlagResponse, error)
-	UpdateFlag(context.Context, *UpdateFlagRequest) (*UpdateFlagResponse, error)
+	UpdateFlagProbability(context.Context, *UpdateFlagProbabilityRequest) (*UpdateFlagProbabilityResponse, error)
 	ListFlags(context.Context, *ListFlagsRequest) (*ListFlagsResponse, error)
 	DeleteFlag(context.Context, *DeleteFlagRequest) (*DeleteFlagResponse, error)
 	mustEmbedUnimplementedFeatureFlagServiceServer()
@@ -1158,8 +1158,8 @@ func (UnimplementedFeatureFlagServiceServer) GetFlag(context.Context, *GetFlagRe
 func (UnimplementedFeatureFlagServiceServer) CreateFlag(context.Context, *CreateFlagRequest) (*CreateFlagResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method CreateFlag not implemented")
 }
-func (UnimplementedFeatureFlagServiceServer) UpdateFlag(context.Context, *UpdateFlagRequest) (*UpdateFlagResponse, error) {
-	return nil, status.Errorf(codes.Unimplemented, "method UpdateFlag not implemented")
+func (UnimplementedFeatureFlagServiceServer) UpdateFlagProbability(context.Context, *UpdateFlagProbabilityRequest) (*UpdateFlagProbabilityResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method UpdateFlagProbability not implemented")
 }
 func (UnimplementedFeatureFlagServiceServer) ListFlags(context.Context, *ListFlagsRequest) (*ListFlagsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ListFlags not implemented")
@@ -1216,20 +1216,20 @@ func _FeatureFlagService_CreateFlag_Handler(srv interface{}, ctx context.Context
 	return interceptor(ctx, in, info, handler)
 }
 
-func _FeatureFlagService_UpdateFlag_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(UpdateFlagRequest)
+func _FeatureFlagService_UpdateFlagProbability_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(UpdateFlagProbabilityRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(FeatureFlagServiceServer).UpdateFlag(ctx, in)
+		return srv.(FeatureFlagServiceServer).UpdateFlagProbability(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: FeatureFlagService_UpdateFlag_FullMethodName,
+		FullMethod: FeatureFlagService_UpdateFlagProbability_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(FeatureFlagServiceServer).UpdateFlag(ctx, req.(*UpdateFlagRequest))
+		return srv.(FeatureFlagServiceServer).UpdateFlagProbability(ctx, req.(*UpdateFlagProbabilityRequest))
 	}
 	return interceptor(ctx, in, info, handler)
 }
@@ -1286,8 +1286,8 @@ var FeatureFlagService_ServiceDesc = grpc.ServiceDesc{
 			Handler:    _FeatureFlagService_CreateFlag_Handler,
 		},
 		{
-			MethodName: "UpdateFlag",
-			Handler:    _FeatureFlagService_UpdateFlag_Handler,
+			MethodName: "UpdateFlagProbability",
+			Handler:    _FeatureFlagService_UpdateFlagProbability_Handler,
 		},
 		{
 			MethodName: "ListFlags",
diff --git a/src/checkoutservice/genproto/oteldemo/demo.pb.go b/src/checkoutservice/genproto/oteldemo/demo.pb.go
index 5d61c9f147..329c7b9603 100644
--- a/src/checkoutservice/genproto/oteldemo/demo.pb.go
+++ b/src/checkoutservice/genproto/oteldemo/demo.pb.go
@@ -15,7 +15,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.31.0
-// 	protoc        v4.25.1
+// 	protoc        v4.25.2
 // source: demo.proto
 
 package oteldemo
@@ -1810,7 +1810,7 @@ func (x *Ad) GetText() string {
 	return ""
 }
 
-type Flag struct {
+type FlagEvaluationResult struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
@@ -1820,8 +1820,8 @@ type Flag struct {
 	Enabled     bool   `protobuf:"varint,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
 }
 
-func (x *Flag) Reset() {
-	*x = Flag{}
+func (x *FlagEvaluationResult) Reset() {
+	*x = FlagEvaluationResult{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_demo_proto_msgTypes[32]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1829,13 +1829,13 @@ func (x *Flag) Reset() {
 	}
 }
 
-func (x *Flag) String() string {
+func (x *FlagEvaluationResult) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*Flag) ProtoMessage() {}
+func (*FlagEvaluationResult) ProtoMessage() {}
 
-func (x *Flag) ProtoReflect() protoreflect.Message {
+func (x *FlagEvaluationResult) ProtoReflect() protoreflect.Message {
 	mi := &file_demo_proto_msgTypes[32]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1847,32 +1847,95 @@ func (x *Flag) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use Flag.ProtoReflect.Descriptor instead.
-func (*Flag) Descriptor() ([]byte, []int) {
+// Deprecated: Use FlagEvaluationResult.ProtoReflect.Descriptor instead.
+func (*FlagEvaluationResult) Descriptor() ([]byte, []int) {
 	return file_demo_proto_rawDescGZIP(), []int{32}
 }
 
-func (x *Flag) GetName() string {
+func (x *FlagEvaluationResult) GetName() string {
 	if x != nil {
 		return x.Name
 	}
 	return ""
 }
 
-func (x *Flag) GetDescription() string {
+func (x *FlagEvaluationResult) GetDescription() string {
 	if x != nil {
 		return x.Description
 	}
 	return ""
 }
 
-func (x *Flag) GetEnabled() bool {
+func (x *FlagEvaluationResult) GetEnabled() bool {
 	if x != nil {
 		return x.Enabled
 	}
 	return false
 }
 
+type FlagDefinition struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name        string  `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Description string  `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
+	Enabled     float32 `protobuf:"fixed32,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
+}
+
+func (x *FlagDefinition) Reset() {
+	*x = FlagDefinition{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_demo_proto_msgTypes[33]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FlagDefinition) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FlagDefinition) ProtoMessage() {}
+
+func (x *FlagDefinition) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[33]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FlagDefinition.ProtoReflect.Descriptor instead.
+func (*FlagDefinition) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{33}
+}
+
+func (x *FlagDefinition) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *FlagDefinition) GetDescription() string {
+	if x != nil {
+		return x.Description
+	}
+	return ""
+}
+
+func (x *FlagDefinition) GetEnabled() float32 {
+	if x != nil {
+		return x.Enabled
+	}
+	return 0
+}
+
 type GetFlagRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1884,7 +1947,7 @@ type GetFlagRequest struct {
 func (x *GetFlagRequest) Reset() {
 	*x = GetFlagRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[33]
+		mi := &file_demo_proto_msgTypes[34]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1897,7 +1960,7 @@ func (x *GetFlagRequest) String() string {
 func (*GetFlagRequest) ProtoMessage() {}
 
 func (x *GetFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[33]
+	mi := &file_demo_proto_msgTypes[34]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1910,7 +1973,7 @@ func (x *GetFlagRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetFlagRequest.ProtoReflect.Descriptor instead.
 func (*GetFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{33}
+	return file_demo_proto_rawDescGZIP(), []int{34}
 }
 
 func (x *GetFlagRequest) GetName() string {
@@ -1925,13 +1988,13 @@ type GetFlagResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Flag *Flag `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
+	Flag *FlagEvaluationResult `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
 }
 
 func (x *GetFlagResponse) Reset() {
 	*x = GetFlagResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[34]
+		mi := &file_demo_proto_msgTypes[35]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1944,7 +2007,7 @@ func (x *GetFlagResponse) String() string {
 func (*GetFlagResponse) ProtoMessage() {}
 
 func (x *GetFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[34]
+	mi := &file_demo_proto_msgTypes[35]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1957,10 +2020,10 @@ func (x *GetFlagResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetFlagResponse.ProtoReflect.Descriptor instead.
 func (*GetFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{34}
+	return file_demo_proto_rawDescGZIP(), []int{35}
 }
 
-func (x *GetFlagResponse) GetFlag() *Flag {
+func (x *GetFlagResponse) GetFlag() *FlagEvaluationResult {
 	if x != nil {
 		return x.Flag
 	}
@@ -1972,15 +2035,15 @@ type CreateFlagRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Name        string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	Description string `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
-	Enabled     bool   `protobuf:"varint,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	Name        string  `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Description string  `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
+	Enabled     float32 `protobuf:"fixed32,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
 }
 
 func (x *CreateFlagRequest) Reset() {
 	*x = CreateFlagRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[35]
+		mi := &file_demo_proto_msgTypes[36]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1993,7 +2056,7 @@ func (x *CreateFlagRequest) String() string {
 func (*CreateFlagRequest) ProtoMessage() {}
 
 func (x *CreateFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[35]
+	mi := &file_demo_proto_msgTypes[36]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2006,7 +2069,7 @@ func (x *CreateFlagRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CreateFlagRequest.ProtoReflect.Descriptor instead.
 func (*CreateFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{35}
+	return file_demo_proto_rawDescGZIP(), []int{36}
 }
 
 func (x *CreateFlagRequest) GetName() string {
@@ -2023,11 +2086,11 @@ func (x *CreateFlagRequest) GetDescription() string {
 	return ""
 }
 
-func (x *CreateFlagRequest) GetEnabled() bool {
+func (x *CreateFlagRequest) GetEnabled() float32 {
 	if x != nil {
 		return x.Enabled
 	}
-	return false
+	return 0
 }
 
 type CreateFlagResponse struct {
@@ -2035,13 +2098,13 @@ type CreateFlagResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Flag *Flag `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
+	Flag *FlagDefinition `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
 }
 
 func (x *CreateFlagResponse) Reset() {
 	*x = CreateFlagResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[36]
+		mi := &file_demo_proto_msgTypes[37]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2054,7 +2117,7 @@ func (x *CreateFlagResponse) String() string {
 func (*CreateFlagResponse) ProtoMessage() {}
 
 func (x *CreateFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[36]
+	mi := &file_demo_proto_msgTypes[37]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2067,42 +2130,42 @@ func (x *CreateFlagResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CreateFlagResponse.ProtoReflect.Descriptor instead.
 func (*CreateFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{36}
+	return file_demo_proto_rawDescGZIP(), []int{37}
 }
 
-func (x *CreateFlagResponse) GetFlag() *Flag {
+func (x *CreateFlagResponse) GetFlag() *FlagDefinition {
 	if x != nil {
 		return x.Flag
 	}
 	return nil
 }
 
-type UpdateFlagRequest struct {
+type UpdateFlagProbabilityRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Name    string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	Enabled bool   `protobuf:"varint,2,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	Name    string  `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Enabled float32 `protobuf:"fixed32,2,opt,name=enabled,proto3" json:"enabled,omitempty"`
 }
 
-func (x *UpdateFlagRequest) Reset() {
-	*x = UpdateFlagRequest{}
+func (x *UpdateFlagProbabilityRequest) Reset() {
+	*x = UpdateFlagProbabilityRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[37]
+		mi := &file_demo_proto_msgTypes[38]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *UpdateFlagRequest) String() string {
+func (x *UpdateFlagProbabilityRequest) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*UpdateFlagRequest) ProtoMessage() {}
+func (*UpdateFlagProbabilityRequest) ProtoMessage() {}
 
-func (x *UpdateFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[37]
+func (x *UpdateFlagProbabilityRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[38]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2113,48 +2176,48 @@ func (x *UpdateFlagRequest) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use UpdateFlagRequest.ProtoReflect.Descriptor instead.
-func (*UpdateFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{37}
+// Deprecated: Use UpdateFlagProbabilityRequest.ProtoReflect.Descriptor instead.
+func (*UpdateFlagProbabilityRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{38}
 }
 
-func (x *UpdateFlagRequest) GetName() string {
+func (x *UpdateFlagProbabilityRequest) GetName() string {
 	if x != nil {
 		return x.Name
 	}
 	return ""
 }
 
-func (x *UpdateFlagRequest) GetEnabled() bool {
+func (x *UpdateFlagProbabilityRequest) GetEnabled() float32 {
 	if x != nil {
 		return x.Enabled
 	}
-	return false
+	return 0
 }
 
-type UpdateFlagResponse struct {
+type UpdateFlagProbabilityResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 }
 
-func (x *UpdateFlagResponse) Reset() {
-	*x = UpdateFlagResponse{}
+func (x *UpdateFlagProbabilityResponse) Reset() {
+	*x = UpdateFlagProbabilityResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[38]
+		mi := &file_demo_proto_msgTypes[39]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *UpdateFlagResponse) String() string {
+func (x *UpdateFlagProbabilityResponse) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*UpdateFlagResponse) ProtoMessage() {}
+func (*UpdateFlagProbabilityResponse) ProtoMessage() {}
 
-func (x *UpdateFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[38]
+func (x *UpdateFlagProbabilityResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[39]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2165,9 +2228,9 @@ func (x *UpdateFlagResponse) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use UpdateFlagResponse.ProtoReflect.Descriptor instead.
-func (*UpdateFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{38}
+// Deprecated: Use UpdateFlagProbabilityResponse.ProtoReflect.Descriptor instead.
+func (*UpdateFlagProbabilityResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{39}
 }
 
 type ListFlagsRequest struct {
@@ -2179,7 +2242,7 @@ type ListFlagsRequest struct {
 func (x *ListFlagsRequest) Reset() {
 	*x = ListFlagsRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[39]
+		mi := &file_demo_proto_msgTypes[40]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2192,7 +2255,7 @@ func (x *ListFlagsRequest) String() string {
 func (*ListFlagsRequest) ProtoMessage() {}
 
 func (x *ListFlagsRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[39]
+	mi := &file_demo_proto_msgTypes[40]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2205,7 +2268,7 @@ func (x *ListFlagsRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListFlagsRequest.ProtoReflect.Descriptor instead.
 func (*ListFlagsRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{39}
+	return file_demo_proto_rawDescGZIP(), []int{40}
 }
 
 type ListFlagsResponse struct {
@@ -2213,13 +2276,13 @@ type ListFlagsResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Flag []*Flag `protobuf:"bytes,1,rep,name=flag,proto3" json:"flag,omitempty"`
+	Flag []*FlagDefinition `protobuf:"bytes,1,rep,name=flag,proto3" json:"flag,omitempty"`
 }
 
 func (x *ListFlagsResponse) Reset() {
 	*x = ListFlagsResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[40]
+		mi := &file_demo_proto_msgTypes[41]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2232,7 +2295,7 @@ func (x *ListFlagsResponse) String() string {
 func (*ListFlagsResponse) ProtoMessage() {}
 
 func (x *ListFlagsResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[40]
+	mi := &file_demo_proto_msgTypes[41]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2245,10 +2308,10 @@ func (x *ListFlagsResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListFlagsResponse.ProtoReflect.Descriptor instead.
 func (*ListFlagsResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{40}
+	return file_demo_proto_rawDescGZIP(), []int{41}
 }
 
-func (x *ListFlagsResponse) GetFlag() []*Flag {
+func (x *ListFlagsResponse) GetFlag() []*FlagDefinition {
 	if x != nil {
 		return x.Flag
 	}
@@ -2266,7 +2329,7 @@ type DeleteFlagRequest struct {
 func (x *DeleteFlagRequest) Reset() {
 	*x = DeleteFlagRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[41]
+		mi := &file_demo_proto_msgTypes[42]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2279,7 +2342,7 @@ func (x *DeleteFlagRequest) String() string {
 func (*DeleteFlagRequest) ProtoMessage() {}
 
 func (x *DeleteFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[41]
+	mi := &file_demo_proto_msgTypes[42]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2292,7 +2355,7 @@ func (x *DeleteFlagRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DeleteFlagRequest.ProtoReflect.Descriptor instead.
 func (*DeleteFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{41}
+	return file_demo_proto_rawDescGZIP(), []int{42}
 }
 
 func (x *DeleteFlagRequest) GetName() string {
@@ -2311,7 +2374,7 @@ type DeleteFlagResponse struct {
 func (x *DeleteFlagResponse) Reset() {
 	*x = DeleteFlagResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[42]
+		mi := &file_demo_proto_msgTypes[43]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2324,7 +2387,7 @@ func (x *DeleteFlagResponse) String() string {
 func (*DeleteFlagResponse) ProtoMessage() {}
 
 func (x *DeleteFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[42]
+	mi := &file_demo_proto_msgTypes[43]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2337,7 +2400,7 @@ func (x *DeleteFlagResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DeleteFlagResponse.ProtoReflect.Descriptor instead.
 func (*DeleteFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{42}
+	return file_demo_proto_rawDescGZIP(), []int{43}
 }
 
 var File_demo_proto protoreflect.FileDescriptor
@@ -2525,146 +2588,159 @@ var file_demo_proto_rawDesc = []byte{
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 }
 
 var (
@@ -2679,7 +2755,7 @@ func file_demo_proto_rawDescGZIP() []byte {
 	return file_demo_proto_rawDescData
 }
 
-var file_demo_proto_msgTypes = make([]protoimpl.MessageInfo, 43)
+var file_demo_proto_msgTypes = make([]protoimpl.MessageInfo, 44)
 var file_demo_proto_goTypes = []interface{}{
 	(*CartItem)(nil),                       // 0: oteldemo.CartItem
 	(*AddItemRequest)(nil),                 // 1: oteldemo.AddItemRequest
@@ -2713,17 +2789,18 @@ var file_demo_proto_goTypes = []interface{}{
 	(*AdRequest)(nil),                      // 29: oteldemo.AdRequest
 	(*AdResponse)(nil),                     // 30: oteldemo.AdResponse
 	(*Ad)(nil),                             // 31: oteldemo.Ad
-	(*Flag)(nil),                           // 32: oteldemo.Flag
-	(*GetFlagRequest)(nil),                 // 33: oteldemo.GetFlagRequest
-	(*GetFlagResponse)(nil),                // 34: oteldemo.GetFlagResponse
-	(*CreateFlagRequest)(nil),              // 35: oteldemo.CreateFlagRequest
-	(*CreateFlagResponse)(nil),             // 36: oteldemo.CreateFlagResponse
-	(*UpdateFlagRequest)(nil),              // 37: oteldemo.UpdateFlagRequest
-	(*UpdateFlagResponse)(nil),             // 38: oteldemo.UpdateFlagResponse
-	(*ListFlagsRequest)(nil),               // 39: oteldemo.ListFlagsRequest
-	(*ListFlagsResponse)(nil),              // 40: oteldemo.ListFlagsResponse
-	(*DeleteFlagRequest)(nil),              // 41: oteldemo.DeleteFlagRequest
-	(*DeleteFlagResponse)(nil),             // 42: oteldemo.DeleteFlagResponse
+	(*FlagEvaluationResult)(nil),           // 32: oteldemo.FlagEvaluationResult
+	(*FlagDefinition)(nil),                 // 33: oteldemo.FlagDefinition
+	(*GetFlagRequest)(nil),                 // 34: oteldemo.GetFlagRequest
+	(*GetFlagResponse)(nil),                // 35: oteldemo.GetFlagResponse
+	(*CreateFlagRequest)(nil),              // 36: oteldemo.CreateFlagRequest
+	(*CreateFlagResponse)(nil),             // 37: oteldemo.CreateFlagResponse
+	(*UpdateFlagProbabilityRequest)(nil),   // 38: oteldemo.UpdateFlagProbabilityRequest
+	(*UpdateFlagProbabilityResponse)(nil),  // 39: oteldemo.UpdateFlagProbabilityResponse
+	(*ListFlagsRequest)(nil),               // 40: oteldemo.ListFlagsRequest
+	(*ListFlagsResponse)(nil),              // 41: oteldemo.ListFlagsResponse
+	(*DeleteFlagRequest)(nil),              // 42: oteldemo.DeleteFlagRequest
+	(*DeleteFlagResponse)(nil),             // 43: oteldemo.DeleteFlagResponse
 }
 var file_demo_proto_depIdxs = []int32{
 	0,  // 0: oteldemo.AddItemRequest.item:type_name -> oteldemo.CartItem
@@ -2749,9 +2826,9 @@ var file_demo_proto_depIdxs = []int32{
 	21, // 20: oteldemo.PlaceOrderRequest.credit_card:type_name -> oteldemo.CreditCardInfo
 	25, // 21: oteldemo.PlaceOrderResponse.order:type_name -> oteldemo.OrderResult
 	31, // 22: oteldemo.AdResponse.ads:type_name -> oteldemo.Ad
-	32, // 23: oteldemo.GetFlagResponse.flag:type_name -> oteldemo.Flag
-	32, // 24: oteldemo.CreateFlagResponse.flag:type_name -> oteldemo.Flag
-	32, // 25: oteldemo.ListFlagsResponse.flag:type_name -> oteldemo.Flag
+	32, // 23: oteldemo.GetFlagResponse.flag:type_name -> oteldemo.FlagEvaluationResult
+	33, // 24: oteldemo.CreateFlagResponse.flag:type_name -> oteldemo.FlagDefinition
+	33, // 25: oteldemo.ListFlagsResponse.flag:type_name -> oteldemo.FlagDefinition
 	1,  // 26: oteldemo.CartService.AddItem:input_type -> oteldemo.AddItemRequest
 	3,  // 27: oteldemo.CartService.GetCart:input_type -> oteldemo.GetCartRequest
 	2,  // 28: oteldemo.CartService.EmptyCart:input_type -> oteldemo.EmptyCartRequest
@@ -2767,11 +2844,11 @@ var file_demo_proto_depIdxs = []int32{
 	26, // 38: oteldemo.EmailService.SendOrderConfirmation:input_type -> oteldemo.SendOrderConfirmationRequest
 	27, // 39: oteldemo.CheckoutService.PlaceOrder:input_type -> oteldemo.PlaceOrderRequest
 	29, // 40: oteldemo.AdService.GetAds:input_type -> oteldemo.AdRequest
-	33, // 41: oteldemo.FeatureFlagService.GetFlag:input_type -> oteldemo.GetFlagRequest
-	35, // 42: oteldemo.FeatureFlagService.CreateFlag:input_type -> oteldemo.CreateFlagRequest
-	37, // 43: oteldemo.FeatureFlagService.UpdateFlag:input_type -> oteldemo.UpdateFlagRequest
-	39, // 44: oteldemo.FeatureFlagService.ListFlags:input_type -> oteldemo.ListFlagsRequest
-	41, // 45: oteldemo.FeatureFlagService.DeleteFlag:input_type -> oteldemo.DeleteFlagRequest
+	34, // 41: oteldemo.FeatureFlagService.GetFlag:input_type -> oteldemo.GetFlagRequest
+	36, // 42: oteldemo.FeatureFlagService.CreateFlag:input_type -> oteldemo.CreateFlagRequest
+	38, // 43: oteldemo.FeatureFlagService.UpdateFlagProbability:input_type -> oteldemo.UpdateFlagProbabilityRequest
+	40, // 44: oteldemo.FeatureFlagService.ListFlags:input_type -> oteldemo.ListFlagsRequest
+	42, // 45: oteldemo.FeatureFlagService.DeleteFlag:input_type -> oteldemo.DeleteFlagRequest
 	5,  // 46: oteldemo.CartService.AddItem:output_type -> oteldemo.Empty
 	4,  // 47: oteldemo.CartService.GetCart:output_type -> oteldemo.Cart
 	5,  // 48: oteldemo.CartService.EmptyCart:output_type -> oteldemo.Empty
@@ -2787,11 +2864,11 @@ var file_demo_proto_depIdxs = []int32{
 	5,  // 58: oteldemo.EmailService.SendOrderConfirmation:output_type -> oteldemo.Empty
 	28, // 59: oteldemo.CheckoutService.PlaceOrder:output_type -> oteldemo.PlaceOrderResponse
 	30, // 60: oteldemo.AdService.GetAds:output_type -> oteldemo.AdResponse
-	34, // 61: oteldemo.FeatureFlagService.GetFlag:output_type -> oteldemo.GetFlagResponse
-	36, // 62: oteldemo.FeatureFlagService.CreateFlag:output_type -> oteldemo.CreateFlagResponse
-	38, // 63: oteldemo.FeatureFlagService.UpdateFlag:output_type -> oteldemo.UpdateFlagResponse
-	40, // 64: oteldemo.FeatureFlagService.ListFlags:output_type -> oteldemo.ListFlagsResponse
-	42, // 65: oteldemo.FeatureFlagService.DeleteFlag:output_type -> oteldemo.DeleteFlagResponse
+	35, // 61: oteldemo.FeatureFlagService.GetFlag:output_type -> oteldemo.GetFlagResponse
+	37, // 62: oteldemo.FeatureFlagService.CreateFlag:output_type -> oteldemo.CreateFlagResponse
+	39, // 63: oteldemo.FeatureFlagService.UpdateFlagProbability:output_type -> oteldemo.UpdateFlagProbabilityResponse
+	41, // 64: oteldemo.FeatureFlagService.ListFlags:output_type -> oteldemo.ListFlagsResponse
+	43, // 65: oteldemo.FeatureFlagService.DeleteFlag:output_type -> oteldemo.DeleteFlagResponse
 	46, // [46:66] is the sub-list for method output_type
 	26, // [26:46] is the sub-list for method input_type
 	26, // [26:26] is the sub-list for extension type_name
@@ -3190,7 +3267,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[32].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Flag); i {
+			switch v := v.(*FlagEvaluationResult); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3202,7 +3279,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[33].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetFlagRequest); i {
+			switch v := v.(*FlagDefinition); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3214,7 +3291,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[34].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetFlagResponse); i {
+			switch v := v.(*GetFlagRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3226,7 +3303,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[35].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CreateFlagRequest); i {
+			switch v := v.(*GetFlagResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3238,7 +3315,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[36].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CreateFlagResponse); i {
+			switch v := v.(*CreateFlagRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3250,7 +3327,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[37].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*UpdateFlagRequest); i {
+			switch v := v.(*CreateFlagResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3262,7 +3339,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[38].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*UpdateFlagResponse); i {
+			switch v := v.(*UpdateFlagProbabilityRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3274,7 +3351,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[39].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListFlagsRequest); i {
+			switch v := v.(*UpdateFlagProbabilityResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3286,7 +3363,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[40].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListFlagsResponse); i {
+			switch v := v.(*ListFlagsRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3298,7 +3375,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[41].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*DeleteFlagRequest); i {
+			switch v := v.(*ListFlagsResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3310,6 +3387,18 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[42].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DeleteFlagRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_demo_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*DeleteFlagResponse); i {
 			case 0:
 				return &v.state
@@ -3328,7 +3417,7 @@ func file_demo_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_demo_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   43,
+			NumMessages:   44,
 			NumExtensions: 0,
 			NumServices:   10,
 		},
diff --git a/src/checkoutservice/genproto/oteldemo/demo_grpc.pb.go b/src/checkoutservice/genproto/oteldemo/demo_grpc.pb.go
index 2002dfbcdc..184b7696d3 100644
--- a/src/checkoutservice/genproto/oteldemo/demo_grpc.pb.go
+++ b/src/checkoutservice/genproto/oteldemo/demo_grpc.pb.go
@@ -15,7 +15,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.3.0
-// - protoc             v4.25.1
+// - protoc             v4.25.2
 // source: demo.proto
 
 package oteldemo
@@ -1065,11 +1065,11 @@ var AdService_ServiceDesc = grpc.ServiceDesc{
 }
 
 const (
-	FeatureFlagService_GetFlag_FullMethodName    = "/oteldemo.FeatureFlagService/GetFlag"
-	FeatureFlagService_CreateFlag_FullMethodName = "/oteldemo.FeatureFlagService/CreateFlag"
-	FeatureFlagService_UpdateFlag_FullMethodName = "/oteldemo.FeatureFlagService/UpdateFlag"
-	FeatureFlagService_ListFlags_FullMethodName  = "/oteldemo.FeatureFlagService/ListFlags"
-	FeatureFlagService_DeleteFlag_FullMethodName = "/oteldemo.FeatureFlagService/DeleteFlag"
+	FeatureFlagService_GetFlag_FullMethodName               = "/oteldemo.FeatureFlagService/GetFlag"
+	FeatureFlagService_CreateFlag_FullMethodName            = "/oteldemo.FeatureFlagService/CreateFlag"
+	FeatureFlagService_UpdateFlagProbability_FullMethodName = "/oteldemo.FeatureFlagService/UpdateFlagProbability"
+	FeatureFlagService_ListFlags_FullMethodName             = "/oteldemo.FeatureFlagService/ListFlags"
+	FeatureFlagService_DeleteFlag_FullMethodName            = "/oteldemo.FeatureFlagService/DeleteFlag"
 )
 
 // FeatureFlagServiceClient is the client API for FeatureFlagService service.
@@ -1078,7 +1078,7 @@ const (
 type FeatureFlagServiceClient interface {
 	GetFlag(ctx context.Context, in *GetFlagRequest, opts ...grpc.CallOption) (*GetFlagResponse, error)
 	CreateFlag(ctx context.Context, in *CreateFlagRequest, opts ...grpc.CallOption) (*CreateFlagResponse, error)
-	UpdateFlag(ctx context.Context, in *UpdateFlagRequest, opts ...grpc.CallOption) (*UpdateFlagResponse, error)
+	UpdateFlagProbability(ctx context.Context, in *UpdateFlagProbabilityRequest, opts ...grpc.CallOption) (*UpdateFlagProbabilityResponse, error)
 	ListFlags(ctx context.Context, in *ListFlagsRequest, opts ...grpc.CallOption) (*ListFlagsResponse, error)
 	DeleteFlag(ctx context.Context, in *DeleteFlagRequest, opts ...grpc.CallOption) (*DeleteFlagResponse, error)
 }
@@ -1109,9 +1109,9 @@ func (c *featureFlagServiceClient) CreateFlag(ctx context.Context, in *CreateFla
 	return out, nil
 }
 
-func (c *featureFlagServiceClient) UpdateFlag(ctx context.Context, in *UpdateFlagRequest, opts ...grpc.CallOption) (*UpdateFlagResponse, error) {
-	out := new(UpdateFlagResponse)
-	err := c.cc.Invoke(ctx, FeatureFlagService_UpdateFlag_FullMethodName, in, out, opts...)
+func (c *featureFlagServiceClient) UpdateFlagProbability(ctx context.Context, in *UpdateFlagProbabilityRequest, opts ...grpc.CallOption) (*UpdateFlagProbabilityResponse, error) {
+	out := new(UpdateFlagProbabilityResponse)
+	err := c.cc.Invoke(ctx, FeatureFlagService_UpdateFlagProbability_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -1142,7 +1142,7 @@ func (c *featureFlagServiceClient) DeleteFlag(ctx context.Context, in *DeleteFla
 type FeatureFlagServiceServer interface {
 	GetFlag(context.Context, *GetFlagRequest) (*GetFlagResponse, error)
 	CreateFlag(context.Context, *CreateFlagRequest) (*CreateFlagResponse, error)
-	UpdateFlag(context.Context, *UpdateFlagRequest) (*UpdateFlagResponse, error)
+	UpdateFlagProbability(context.Context, *UpdateFlagProbabilityRequest) (*UpdateFlagProbabilityResponse, error)
 	ListFlags(context.Context, *ListFlagsRequest) (*ListFlagsResponse, error)
 	DeleteFlag(context.Context, *DeleteFlagRequest) (*DeleteFlagResponse, error)
 	mustEmbedUnimplementedFeatureFlagServiceServer()
@@ -1158,8 +1158,8 @@ func (UnimplementedFeatureFlagServiceServer) GetFlag(context.Context, *GetFlagRe
 func (UnimplementedFeatureFlagServiceServer) CreateFlag(context.Context, *CreateFlagRequest) (*CreateFlagResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method CreateFlag not implemented")
 }
-func (UnimplementedFeatureFlagServiceServer) UpdateFlag(context.Context, *UpdateFlagRequest) (*UpdateFlagResponse, error) {
-	return nil, status.Errorf(codes.Unimplemented, "method UpdateFlag not implemented")
+func (UnimplementedFeatureFlagServiceServer) UpdateFlagProbability(context.Context, *UpdateFlagProbabilityRequest) (*UpdateFlagProbabilityResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method UpdateFlagProbability not implemented")
 }
 func (UnimplementedFeatureFlagServiceServer) ListFlags(context.Context, *ListFlagsRequest) (*ListFlagsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ListFlags not implemented")
@@ -1216,20 +1216,20 @@ func _FeatureFlagService_CreateFlag_Handler(srv interface{}, ctx context.Context
 	return interceptor(ctx, in, info, handler)
 }
 
-func _FeatureFlagService_UpdateFlag_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(UpdateFlagRequest)
+func _FeatureFlagService_UpdateFlagProbability_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(UpdateFlagProbabilityRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(FeatureFlagServiceServer).UpdateFlag(ctx, in)
+		return srv.(FeatureFlagServiceServer).UpdateFlagProbability(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: FeatureFlagService_UpdateFlag_FullMethodName,
+		FullMethod: FeatureFlagService_UpdateFlagProbability_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(FeatureFlagServiceServer).UpdateFlag(ctx, req.(*UpdateFlagRequest))
+		return srv.(FeatureFlagServiceServer).UpdateFlagProbability(ctx, req.(*UpdateFlagProbabilityRequest))
 	}
 	return interceptor(ctx, in, info, handler)
 }
@@ -1286,8 +1286,8 @@ var FeatureFlagService_ServiceDesc = grpc.ServiceDesc{
 			Handler:    _FeatureFlagService_CreateFlag_Handler,
 		},
 		{
-			MethodName: "UpdateFlag",
-			Handler:    _FeatureFlagService_UpdateFlag_Handler,
+			MethodName: "UpdateFlagProbability",
+			Handler:    _FeatureFlagService_UpdateFlagProbability_Handler,
 		},
 		{
 			MethodName: "ListFlags",
diff --git a/src/featureflagservice/src/ffs_service.erl b/src/featureflagservice/src/ffs_service.erl
index 421ce7ce23..fbebe53c20 100644
--- a/src/featureflagservice/src/ffs_service.erl
+++ b/src/featureflagservice/src/ffs_service.erl
@@ -18,7 +18,7 @@
 
 -export([get_flag/2,
   create_flag/2,
-  update_flag/2,
+  update_flag_probability/2,
   list_flags/2,
   delete_flag/2]).
 
@@ -32,6 +32,7 @@ get_flag(Ctx, #{name := Name}) ->
   case 'Elixir.Featureflagservice.FeatureFlags':get_feature_flag_by_name(Name) of
     nil ->
       {grpc_error, {?GRPC_STATUS_NOT_FOUND, <<"the requested feature flag does not exist">>}};
+
     #{'__struct__' := 'Elixir.Featureflagservice.FeatureFlags.FeatureFlag',
       description := Description,
       enabled := Enabled
@@ -48,25 +49,76 @@ get_flag(Ctx, #{name := Name}) ->
         description => Description,
         enabled => FlagEnabledValue},
 
-      {ok, #{flag => Flag}, Ctx}
+      {ok, #{flag => Flag}, Ctx};
+
+    _ ->
+      {grpc_error, {?GRPC_STATUS_INTERNAL, <<"unexpected response from get_feature_flag_by_name">>}}
+
   end.
 
 -spec create_flag(ctx:t(), ffs_demo_pb:create_flag_request()) ->
   {ok, ffs_demo_pb:create_flag_response(), ctx:t()} | grpcbox_stream:grpc_error_response().
-create_flag(_Ctx, _) ->
-  {grpc_error, {?GRPC_STATUS_UNIMPLEMENTED, <<"use the web interface to create flags.">>}}.
+create_flag(Ctx, Flag) ->
+  'Elixir.Featureflagservice.FeatureFlags':create_feature_flag(Flag),
+  {ok, #{}, Ctx}.
+
+-spec update_flag_probability(ctx:t(), ffs_demo_pb:update_flag_probability_request()) ->
+  {ok, ffs_demo_pb:update_flag_probability_response(), ctx:t()} | grpcbox_stream:grpc_error_response().
+update_flag_probability(Ctx, #{name := Name, enabled := Probability}) ->
+  Flag = 'Elixir.Featureflagservice.FeatureFlags':get_feature_flag_by_name(Name),
+  case Flag of
+    nil ->
+      {grpc_error, {?GRPC_STATUS_NOT_FOUND, <<"the requested feature flag does not exist">>}};
 
--spec update_flag(ctx:t(), ffs_demo_pb:update_flag_request()) ->
-  {ok, ffs_demo_pb:update_flag_response(), ctx:t()} | grpcbox_stream:grpc_error_response().
-update_flag(_Ctx, _) ->
-  {grpc_error, {?GRPC_STATUS_UNIMPLEMENTED, <<"use the web interface to update flags.">>}}.
+    #{'__struct__' := 'Elixir.Featureflagservice.FeatureFlags.FeatureFlag',
+      name := _,
+      description := _,
+      enabled := _
+    } ->
+      'Elixir.Featureflagservice.FeatureFlags':update_feature_flag(
+        Flag,
+        #{enabled => Probability}
+      ),
+      {ok, #{}, Ctx};
+
+    _ ->
+      {grpc_error, {?GRPC_STATUS_INTERNAL, <<"unexpected response from get_feature_flag_by_name">>}}
+  end.
 
 -spec list_flags(ctx:t(), ffs_demo_pb:list_flags_request()) ->
   {ok, ffs_demo_pb:list_flags_response(), ctx:t()} | grpcbox_stream:grpc_error_response().
-list_flags(_Ctx, _) ->
-  {grpc_error, {?GRPC_STATUS_UNIMPLEMENTED, <<"use the web interface to view all flags.">>}}.
+list_flags(Ctx, _) ->
+  Flags = lists:map(fun unpack_flag/1, 'Elixir.Featureflagservice.FeatureFlags':list_feature_flags()),
+  {ok, #{flag => Flags}, Ctx}.
+
+unpack_flag(Flag) ->
+  case Flag of
+    #{'__struct__' := 'Elixir.Featureflagservice.FeatureFlags.FeatureFlag',
+      name := Name,
+      description := Description,
+      enabled := Probability
+    } ->
+      #{name => Name,
+        description => Description,
+        enabled => Probability}
+  end.
 
 -spec delete_flag(ctx:t(), ffs_demo_pb:delete_flag_request()) ->
   {ok, ffs_demo_pb:delete_flag_response(), ctx:t()} | grpcbox_stream:grpc_error_response().
-delete_flag(_Ctx, _) ->
-  {grpc_error, {?GRPC_STATUS_UNIMPLEMENTED, <<"use the web interface to delete flags.">>}}.
+delete_flag(Ctx, #{name := Name}) ->
+  Flag = 'Elixir.Featureflagservice.FeatureFlags':get_feature_flag_by_name(Name),
+  case Flag of
+    nil ->
+      {grpc_error, {?GRPC_STATUS_NOT_FOUND, <<"the requested feature flag does not exist">>}};
+
+    #{'__struct__' := 'Elixir.Featureflagservice.FeatureFlags.FeatureFlag',
+      name := _,
+      description := _,
+      enabled := _
+    } ->
+      'Elixir.Featureflagservice.FeatureFlags':delete_feature_flag(Flag),
+      {ok, #{}, Ctx};
+
+    _ ->
+      {grpc_error, {?GRPC_STATUS_INTERNAL, <<"unexpected response from get_feature_flag_by_name">>}}
+  end.
diff --git a/src/frontend/gateways/rpc/FeatureFlag.gateway.ts b/src/frontend/gateways/rpc/FeatureFlag.gateway.ts
new file mode 100644
index 0000000000..39b9fa7f76
--- /dev/null
+++ b/src/frontend/gateways/rpc/FeatureFlag.gateway.ts
@@ -0,0 +1,63 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+import {ChannelCredentials, status} from '@grpc/grpc-js';
+import {
+    CreateFlagRequest,
+    CreateFlagResponse,
+    DeleteFlagResponse,
+    FeatureFlagServiceClient,
+    GetFlagResponse,
+    ListFlagsResponse,
+    UpdateFlagProbabilityRequest,
+    UpdateFlagProbabilityResponse
+} from '../../protos/demo';
+
+const {FEATURE_FLAG_GRPC_SERVICE_ADDR = ''} = process.env;
+
+const client = new FeatureFlagServiceClient(FEATURE_FLAG_GRPC_SERVICE_ADDR, ChannelCredentials.createInsecure());
+
+const FeatureFlagGateway = () => ({
+
+    getFeatureFlag(name: string) {
+        return new Promise<GetFlagResponse>((resolve, reject) =>
+            client.getFlag({name}, (error, response) => (error ? reject(error) : resolve(response)))
+        );
+    },
+
+    createFeatureFlag(flag: CreateFlagRequest) {
+        return new Promise<CreateFlagResponse>((resolve, reject) =>
+            client.createFlag(flag, (error, response) => (error ? reject(error) : resolve(response)))
+        );
+    },
+
+    updateFeatureFlag(name: string, flag: UpdateFlagProbabilityRequest) {
+        return new Promise<UpdateFlagProbabilityResponse>((resolve, reject) => client.updateFlagProbability(flag, (error, response) => (error ? reject(error) : resolve(response)))
+        );
+    },
+
+    listFeatureFlags() {
+        return new Promise<ListFlagsResponse>((resolve, reject) =>
+            client.listFlags({}, (error, response) => (error ? reject(error) : resolve(response)))
+        );
+    },
+
+    deleteFeatureFlag(name: string) {
+        return new Promise<DeleteFlagResponse>((resolve, reject) => client.deleteFlag({name},
+                (error, response) => {
+                    if (error) {
+                        if (error.code === status.NOT_FOUND) {
+                            return resolve({} as DeleteFlagResponse)
+                        } else {
+                            return reject(error)
+                        }
+                    }
+                    resolve(response)
+                }
+            )
+        );
+    },
+
+});
+
+export default FeatureFlagGateway();
diff --git a/src/frontend/pages/api/featureflags/[name]/index.ts b/src/frontend/pages/api/featureflags/[name]/index.ts
new file mode 100644
index 0000000000..a677e0e379
--- /dev/null
+++ b/src/frontend/pages/api/featureflags/[name]/index.ts
@@ -0,0 +1,46 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+import type {NextApiRequest, NextApiResponse} from 'next';
+import FeatureFlagGateway from '../../../../gateways/rpc/FeatureFlag.gateway';
+import {Empty, FlagEvaluationResult, UpdateFlagProbabilityRequest} from '../../../../protos/demo';
+
+type TResponse = FlagEvaluationResult | Empty;
+
+const handler = async ({method, query, body}: NextApiRequest, res: NextApiResponse<TResponse>) => {
+    switch (method) {
+        case 'GET': {
+            const {name = ''} = query
+            const flag = await FeatureFlagGateway.getFeatureFlag(name as string);
+            return res.status(200).json(flag);
+        }
+
+        case 'PUT': {
+            const {name} = query
+            if (!name || Array.isArray(name)) {
+                return res.status(400).end()
+            }
+            if (!body || typeof body.enabled !== 'number'){
+                return res.status(400).end()
+            }
+            const updateFlagProbabilityRequest = body as UpdateFlagProbabilityRequest;
+            // The name is part of the resource path, and we do not want to require clients to repeat the name in the request
+            // body; but on the grpc level the name needs to be in the message body, so we move it there.
+            updateFlagProbabilityRequest.name = name;
+            await FeatureFlagGateway.updateFeatureFlag(name as string, updateFlagProbabilityRequest);
+            return res.status(204).end();
+        }
+
+        case 'DELETE': {
+            const {name = ''} = query
+            await FeatureFlagGateway.deleteFeatureFlag(name as string);
+            return res.status(204).end();
+        }
+
+        default: {
+            return res.status(405).end();
+        }
+    }
+};
+
+export default handler;
diff --git a/src/frontend/pages/api/featureflags/index.ts b/src/frontend/pages/api/featureflags/index.ts
new file mode 100644
index 0000000000..0f7595fc5f
--- /dev/null
+++ b/src/frontend/pages/api/featureflags/index.ts
@@ -0,0 +1,32 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+import type {NextApiRequest, NextApiResponse} from 'next';
+import FeatureFlagGateway from '../../../gateways/rpc/FeatureFlag.gateway';
+import {CreateFlagRequest, Empty, FlagDefinition} from '../../../protos/demo';
+
+type TResponse = FlagDefinition[] | FlagDefinition | Empty;
+
+const handler = async ({method, body}: NextApiRequest, res: NextApiResponse<TResponse>) => {
+    switch (method) {
+        case 'POST': {
+            if (!body || typeof body.name !== 'string' || typeof body.description !== 'string' || typeof body.enabled !== 'number') {
+                return res.status(400).end()
+            }
+            const flagFromRequest = body as CreateFlagRequest
+            const {flag: flagFromResponse} = await FeatureFlagGateway.createFeatureFlag(flagFromRequest);
+            return res.status(200).json(flagFromResponse!);
+        }
+
+        case 'GET': {
+            const {flag: allFlags} = await FeatureFlagGateway.listFeatureFlags();
+            return res.status(200).json(allFlags);
+        }
+
+        default: {
+            return res.status(405).send('');
+        }
+    }
+};
+
+export default handler;
diff --git a/src/productcatalogservice/genproto/oteldemo/demo.pb.go b/src/productcatalogservice/genproto/oteldemo/demo.pb.go
index 5d61c9f147..329c7b9603 100644
--- a/src/productcatalogservice/genproto/oteldemo/demo.pb.go
+++ b/src/productcatalogservice/genproto/oteldemo/demo.pb.go
@@ -15,7 +15,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.31.0
-// 	protoc        v4.25.1
+// 	protoc        v4.25.2
 // source: demo.proto
 
 package oteldemo
@@ -1810,7 +1810,7 @@ func (x *Ad) GetText() string {
 	return ""
 }
 
-type Flag struct {
+type FlagEvaluationResult struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
@@ -1820,8 +1820,8 @@ type Flag struct {
 	Enabled     bool   `protobuf:"varint,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
 }
 
-func (x *Flag) Reset() {
-	*x = Flag{}
+func (x *FlagEvaluationResult) Reset() {
+	*x = FlagEvaluationResult{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_demo_proto_msgTypes[32]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1829,13 +1829,13 @@ func (x *Flag) Reset() {
 	}
 }
 
-func (x *Flag) String() string {
+func (x *FlagEvaluationResult) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*Flag) ProtoMessage() {}
+func (*FlagEvaluationResult) ProtoMessage() {}
 
-func (x *Flag) ProtoReflect() protoreflect.Message {
+func (x *FlagEvaluationResult) ProtoReflect() protoreflect.Message {
 	mi := &file_demo_proto_msgTypes[32]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -1847,32 +1847,95 @@ func (x *Flag) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use Flag.ProtoReflect.Descriptor instead.
-func (*Flag) Descriptor() ([]byte, []int) {
+// Deprecated: Use FlagEvaluationResult.ProtoReflect.Descriptor instead.
+func (*FlagEvaluationResult) Descriptor() ([]byte, []int) {
 	return file_demo_proto_rawDescGZIP(), []int{32}
 }
 
-func (x *Flag) GetName() string {
+func (x *FlagEvaluationResult) GetName() string {
 	if x != nil {
 		return x.Name
 	}
 	return ""
 }
 
-func (x *Flag) GetDescription() string {
+func (x *FlagEvaluationResult) GetDescription() string {
 	if x != nil {
 		return x.Description
 	}
 	return ""
 }
 
-func (x *Flag) GetEnabled() bool {
+func (x *FlagEvaluationResult) GetEnabled() bool {
 	if x != nil {
 		return x.Enabled
 	}
 	return false
 }
 
+type FlagDefinition struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name        string  `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Description string  `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
+	Enabled     float32 `protobuf:"fixed32,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
+}
+
+func (x *FlagDefinition) Reset() {
+	*x = FlagDefinition{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_demo_proto_msgTypes[33]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FlagDefinition) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FlagDefinition) ProtoMessage() {}
+
+func (x *FlagDefinition) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[33]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FlagDefinition.ProtoReflect.Descriptor instead.
+func (*FlagDefinition) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{33}
+}
+
+func (x *FlagDefinition) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *FlagDefinition) GetDescription() string {
+	if x != nil {
+		return x.Description
+	}
+	return ""
+}
+
+func (x *FlagDefinition) GetEnabled() float32 {
+	if x != nil {
+		return x.Enabled
+	}
+	return 0
+}
+
 type GetFlagRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1884,7 +1947,7 @@ type GetFlagRequest struct {
 func (x *GetFlagRequest) Reset() {
 	*x = GetFlagRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[33]
+		mi := &file_demo_proto_msgTypes[34]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1897,7 +1960,7 @@ func (x *GetFlagRequest) String() string {
 func (*GetFlagRequest) ProtoMessage() {}
 
 func (x *GetFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[33]
+	mi := &file_demo_proto_msgTypes[34]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1910,7 +1973,7 @@ func (x *GetFlagRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetFlagRequest.ProtoReflect.Descriptor instead.
 func (*GetFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{33}
+	return file_demo_proto_rawDescGZIP(), []int{34}
 }
 
 func (x *GetFlagRequest) GetName() string {
@@ -1925,13 +1988,13 @@ type GetFlagResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Flag *Flag `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
+	Flag *FlagEvaluationResult `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
 }
 
 func (x *GetFlagResponse) Reset() {
 	*x = GetFlagResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[34]
+		mi := &file_demo_proto_msgTypes[35]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1944,7 +2007,7 @@ func (x *GetFlagResponse) String() string {
 func (*GetFlagResponse) ProtoMessage() {}
 
 func (x *GetFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[34]
+	mi := &file_demo_proto_msgTypes[35]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1957,10 +2020,10 @@ func (x *GetFlagResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use GetFlagResponse.ProtoReflect.Descriptor instead.
 func (*GetFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{34}
+	return file_demo_proto_rawDescGZIP(), []int{35}
 }
 
-func (x *GetFlagResponse) GetFlag() *Flag {
+func (x *GetFlagResponse) GetFlag() *FlagEvaluationResult {
 	if x != nil {
 		return x.Flag
 	}
@@ -1972,15 +2035,15 @@ type CreateFlagRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Name        string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	Description string `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
-	Enabled     bool   `protobuf:"varint,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	Name        string  `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Description string  `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
+	Enabled     float32 `protobuf:"fixed32,3,opt,name=enabled,proto3" json:"enabled,omitempty"`
 }
 
 func (x *CreateFlagRequest) Reset() {
 	*x = CreateFlagRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[35]
+		mi := &file_demo_proto_msgTypes[36]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1993,7 +2056,7 @@ func (x *CreateFlagRequest) String() string {
 func (*CreateFlagRequest) ProtoMessage() {}
 
 func (x *CreateFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[35]
+	mi := &file_demo_proto_msgTypes[36]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2006,7 +2069,7 @@ func (x *CreateFlagRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CreateFlagRequest.ProtoReflect.Descriptor instead.
 func (*CreateFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{35}
+	return file_demo_proto_rawDescGZIP(), []int{36}
 }
 
 func (x *CreateFlagRequest) GetName() string {
@@ -2023,11 +2086,11 @@ func (x *CreateFlagRequest) GetDescription() string {
 	return ""
 }
 
-func (x *CreateFlagRequest) GetEnabled() bool {
+func (x *CreateFlagRequest) GetEnabled() float32 {
 	if x != nil {
 		return x.Enabled
 	}
-	return false
+	return 0
 }
 
 type CreateFlagResponse struct {
@@ -2035,13 +2098,13 @@ type CreateFlagResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Flag *Flag `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
+	Flag *FlagDefinition `protobuf:"bytes,1,opt,name=flag,proto3" json:"flag,omitempty"`
 }
 
 func (x *CreateFlagResponse) Reset() {
 	*x = CreateFlagResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[36]
+		mi := &file_demo_proto_msgTypes[37]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2054,7 +2117,7 @@ func (x *CreateFlagResponse) String() string {
 func (*CreateFlagResponse) ProtoMessage() {}
 
 func (x *CreateFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[36]
+	mi := &file_demo_proto_msgTypes[37]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2067,42 +2130,42 @@ func (x *CreateFlagResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CreateFlagResponse.ProtoReflect.Descriptor instead.
 func (*CreateFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{36}
+	return file_demo_proto_rawDescGZIP(), []int{37}
 }
 
-func (x *CreateFlagResponse) GetFlag() *Flag {
+func (x *CreateFlagResponse) GetFlag() *FlagDefinition {
 	if x != nil {
 		return x.Flag
 	}
 	return nil
 }
 
-type UpdateFlagRequest struct {
+type UpdateFlagProbabilityRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Name    string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	Enabled bool   `protobuf:"varint,2,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	Name    string  `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Enabled float32 `protobuf:"fixed32,2,opt,name=enabled,proto3" json:"enabled,omitempty"`
 }
 
-func (x *UpdateFlagRequest) Reset() {
-	*x = UpdateFlagRequest{}
+func (x *UpdateFlagProbabilityRequest) Reset() {
+	*x = UpdateFlagProbabilityRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[37]
+		mi := &file_demo_proto_msgTypes[38]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *UpdateFlagRequest) String() string {
+func (x *UpdateFlagProbabilityRequest) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*UpdateFlagRequest) ProtoMessage() {}
+func (*UpdateFlagProbabilityRequest) ProtoMessage() {}
 
-func (x *UpdateFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[37]
+func (x *UpdateFlagProbabilityRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[38]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2113,48 +2176,48 @@ func (x *UpdateFlagRequest) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use UpdateFlagRequest.ProtoReflect.Descriptor instead.
-func (*UpdateFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{37}
+// Deprecated: Use UpdateFlagProbabilityRequest.ProtoReflect.Descriptor instead.
+func (*UpdateFlagProbabilityRequest) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{38}
 }
 
-func (x *UpdateFlagRequest) GetName() string {
+func (x *UpdateFlagProbabilityRequest) GetName() string {
 	if x != nil {
 		return x.Name
 	}
 	return ""
 }
 
-func (x *UpdateFlagRequest) GetEnabled() bool {
+func (x *UpdateFlagProbabilityRequest) GetEnabled() float32 {
 	if x != nil {
 		return x.Enabled
 	}
-	return false
+	return 0
 }
 
-type UpdateFlagResponse struct {
+type UpdateFlagProbabilityResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 }
 
-func (x *UpdateFlagResponse) Reset() {
-	*x = UpdateFlagResponse{}
+func (x *UpdateFlagProbabilityResponse) Reset() {
+	*x = UpdateFlagProbabilityResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[38]
+		mi := &file_demo_proto_msgTypes[39]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *UpdateFlagResponse) String() string {
+func (x *UpdateFlagProbabilityResponse) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*UpdateFlagResponse) ProtoMessage() {}
+func (*UpdateFlagProbabilityResponse) ProtoMessage() {}
 
-func (x *UpdateFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[38]
+func (x *UpdateFlagProbabilityResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_demo_proto_msgTypes[39]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2165,9 +2228,9 @@ func (x *UpdateFlagResponse) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use UpdateFlagResponse.ProtoReflect.Descriptor instead.
-func (*UpdateFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{38}
+// Deprecated: Use UpdateFlagProbabilityResponse.ProtoReflect.Descriptor instead.
+func (*UpdateFlagProbabilityResponse) Descriptor() ([]byte, []int) {
+	return file_demo_proto_rawDescGZIP(), []int{39}
 }
 
 type ListFlagsRequest struct {
@@ -2179,7 +2242,7 @@ type ListFlagsRequest struct {
 func (x *ListFlagsRequest) Reset() {
 	*x = ListFlagsRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[39]
+		mi := &file_demo_proto_msgTypes[40]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2192,7 +2255,7 @@ func (x *ListFlagsRequest) String() string {
 func (*ListFlagsRequest) ProtoMessage() {}
 
 func (x *ListFlagsRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[39]
+	mi := &file_demo_proto_msgTypes[40]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2205,7 +2268,7 @@ func (x *ListFlagsRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListFlagsRequest.ProtoReflect.Descriptor instead.
 func (*ListFlagsRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{39}
+	return file_demo_proto_rawDescGZIP(), []int{40}
 }
 
 type ListFlagsResponse struct {
@@ -2213,13 +2276,13 @@ type ListFlagsResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Flag []*Flag `protobuf:"bytes,1,rep,name=flag,proto3" json:"flag,omitempty"`
+	Flag []*FlagDefinition `protobuf:"bytes,1,rep,name=flag,proto3" json:"flag,omitempty"`
 }
 
 func (x *ListFlagsResponse) Reset() {
 	*x = ListFlagsResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[40]
+		mi := &file_demo_proto_msgTypes[41]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2232,7 +2295,7 @@ func (x *ListFlagsResponse) String() string {
 func (*ListFlagsResponse) ProtoMessage() {}
 
 func (x *ListFlagsResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[40]
+	mi := &file_demo_proto_msgTypes[41]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2245,10 +2308,10 @@ func (x *ListFlagsResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListFlagsResponse.ProtoReflect.Descriptor instead.
 func (*ListFlagsResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{40}
+	return file_demo_proto_rawDescGZIP(), []int{41}
 }
 
-func (x *ListFlagsResponse) GetFlag() []*Flag {
+func (x *ListFlagsResponse) GetFlag() []*FlagDefinition {
 	if x != nil {
 		return x.Flag
 	}
@@ -2266,7 +2329,7 @@ type DeleteFlagRequest struct {
 func (x *DeleteFlagRequest) Reset() {
 	*x = DeleteFlagRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[41]
+		mi := &file_demo_proto_msgTypes[42]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2279,7 +2342,7 @@ func (x *DeleteFlagRequest) String() string {
 func (*DeleteFlagRequest) ProtoMessage() {}
 
 func (x *DeleteFlagRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[41]
+	mi := &file_demo_proto_msgTypes[42]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2292,7 +2355,7 @@ func (x *DeleteFlagRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DeleteFlagRequest.ProtoReflect.Descriptor instead.
 func (*DeleteFlagRequest) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{41}
+	return file_demo_proto_rawDescGZIP(), []int{42}
 }
 
 func (x *DeleteFlagRequest) GetName() string {
@@ -2311,7 +2374,7 @@ type DeleteFlagResponse struct {
 func (x *DeleteFlagResponse) Reset() {
 	*x = DeleteFlagResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_demo_proto_msgTypes[42]
+		mi := &file_demo_proto_msgTypes[43]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2324,7 +2387,7 @@ func (x *DeleteFlagResponse) String() string {
 func (*DeleteFlagResponse) ProtoMessage() {}
 
 func (x *DeleteFlagResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_demo_proto_msgTypes[42]
+	mi := &file_demo_proto_msgTypes[43]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2337,7 +2400,7 @@ func (x *DeleteFlagResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DeleteFlagResponse.ProtoReflect.Descriptor instead.
 func (*DeleteFlagResponse) Descriptor() ([]byte, []int) {
-	return file_demo_proto_rawDescGZIP(), []int{42}
+	return file_demo_proto_rawDescGZIP(), []int{43}
 }
 
 var File_demo_proto protoreflect.FileDescriptor
@@ -2525,146 +2588,159 @@ var file_demo_proto_rawDesc = []byte{
 	0x0a, 0x02, 0x41, 0x64, 0x12, 0x21, 0x0a, 0x0c, 0x72, 0x65, 0x64, 0x69, 0x72, 0x65, 0x63, 0x74,
 	0x5f, 0x75, 0x72, 0x6c, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b, 0x72, 0x65, 0x64, 0x69,
 	0x72, 0x65, 0x63, 0x74, 0x55, 0x72, 0x6c, 0x12, 0x12, 0x0a, 0x04, 0x74, 0x65, 0x78, 0x74, 0x18,
-	0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x74, 0x65, 0x78, 0x74, 0x22, 0x56, 0x0a, 0x04, 0x46,
-	0x6c, 0x61, 0x67, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28,
+	0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x74, 0x65, 0x78, 0x74, 0x22, 0x66, 0x0a, 0x14, 0x46,
+	0x6c, 0x61, 0x67, 0x45, 0x76, 0x61, 0x6c, 0x75, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x52, 0x65, 0x73,
+	0x75, 0x6c, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28,
 	0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x20, 0x0a, 0x0b, 0x64, 0x65, 0x73, 0x63, 0x72,
 	0x69, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b, 0x64, 0x65,
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+	0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -2679,7 +2755,7 @@ func file_demo_proto_rawDescGZIP() []byte {
 	return file_demo_proto_rawDescData
 }
 
-var file_demo_proto_msgTypes = make([]protoimpl.MessageInfo, 43)
+var file_demo_proto_msgTypes = make([]protoimpl.MessageInfo, 44)
 var file_demo_proto_goTypes = []interface{}{
 	(*CartItem)(nil),                       // 0: oteldemo.CartItem
 	(*AddItemRequest)(nil),                 // 1: oteldemo.AddItemRequest
@@ -2713,17 +2789,18 @@ var file_demo_proto_goTypes = []interface{}{
 	(*AdRequest)(nil),                      // 29: oteldemo.AdRequest
 	(*AdResponse)(nil),                     // 30: oteldemo.AdResponse
 	(*Ad)(nil),                             // 31: oteldemo.Ad
-	(*Flag)(nil),                           // 32: oteldemo.Flag
-	(*GetFlagRequest)(nil),                 // 33: oteldemo.GetFlagRequest
-	(*GetFlagResponse)(nil),                // 34: oteldemo.GetFlagResponse
-	(*CreateFlagRequest)(nil),              // 35: oteldemo.CreateFlagRequest
-	(*CreateFlagResponse)(nil),             // 36: oteldemo.CreateFlagResponse
-	(*UpdateFlagRequest)(nil),              // 37: oteldemo.UpdateFlagRequest
-	(*UpdateFlagResponse)(nil),             // 38: oteldemo.UpdateFlagResponse
-	(*ListFlagsRequest)(nil),               // 39: oteldemo.ListFlagsRequest
-	(*ListFlagsResponse)(nil),              // 40: oteldemo.ListFlagsResponse
-	(*DeleteFlagRequest)(nil),              // 41: oteldemo.DeleteFlagRequest
-	(*DeleteFlagResponse)(nil),             // 42: oteldemo.DeleteFlagResponse
+	(*FlagEvaluationResult)(nil),           // 32: oteldemo.FlagEvaluationResult
+	(*FlagDefinition)(nil),                 // 33: oteldemo.FlagDefinition
+	(*GetFlagRequest)(nil),                 // 34: oteldemo.GetFlagRequest
+	(*GetFlagResponse)(nil),                // 35: oteldemo.GetFlagResponse
+	(*CreateFlagRequest)(nil),              // 36: oteldemo.CreateFlagRequest
+	(*CreateFlagResponse)(nil),             // 37: oteldemo.CreateFlagResponse
+	(*UpdateFlagProbabilityRequest)(nil),   // 38: oteldemo.UpdateFlagProbabilityRequest
+	(*UpdateFlagProbabilityResponse)(nil),  // 39: oteldemo.UpdateFlagProbabilityResponse
+	(*ListFlagsRequest)(nil),               // 40: oteldemo.ListFlagsRequest
+	(*ListFlagsResponse)(nil),              // 41: oteldemo.ListFlagsResponse
+	(*DeleteFlagRequest)(nil),              // 42: oteldemo.DeleteFlagRequest
+	(*DeleteFlagResponse)(nil),             // 43: oteldemo.DeleteFlagResponse
 }
 var file_demo_proto_depIdxs = []int32{
 	0,  // 0: oteldemo.AddItemRequest.item:type_name -> oteldemo.CartItem
@@ -2749,9 +2826,9 @@ var file_demo_proto_depIdxs = []int32{
 	21, // 20: oteldemo.PlaceOrderRequest.credit_card:type_name -> oteldemo.CreditCardInfo
 	25, // 21: oteldemo.PlaceOrderResponse.order:type_name -> oteldemo.OrderResult
 	31, // 22: oteldemo.AdResponse.ads:type_name -> oteldemo.Ad
-	32, // 23: oteldemo.GetFlagResponse.flag:type_name -> oteldemo.Flag
-	32, // 24: oteldemo.CreateFlagResponse.flag:type_name -> oteldemo.Flag
-	32, // 25: oteldemo.ListFlagsResponse.flag:type_name -> oteldemo.Flag
+	32, // 23: oteldemo.GetFlagResponse.flag:type_name -> oteldemo.FlagEvaluationResult
+	33, // 24: oteldemo.CreateFlagResponse.flag:type_name -> oteldemo.FlagDefinition
+	33, // 25: oteldemo.ListFlagsResponse.flag:type_name -> oteldemo.FlagDefinition
 	1,  // 26: oteldemo.CartService.AddItem:input_type -> oteldemo.AddItemRequest
 	3,  // 27: oteldemo.CartService.GetCart:input_type -> oteldemo.GetCartRequest
 	2,  // 28: oteldemo.CartService.EmptyCart:input_type -> oteldemo.EmptyCartRequest
@@ -2767,11 +2844,11 @@ var file_demo_proto_depIdxs = []int32{
 	26, // 38: oteldemo.EmailService.SendOrderConfirmation:input_type -> oteldemo.SendOrderConfirmationRequest
 	27, // 39: oteldemo.CheckoutService.PlaceOrder:input_type -> oteldemo.PlaceOrderRequest
 	29, // 40: oteldemo.AdService.GetAds:input_type -> oteldemo.AdRequest
-	33, // 41: oteldemo.FeatureFlagService.GetFlag:input_type -> oteldemo.GetFlagRequest
-	35, // 42: oteldemo.FeatureFlagService.CreateFlag:input_type -> oteldemo.CreateFlagRequest
-	37, // 43: oteldemo.FeatureFlagService.UpdateFlag:input_type -> oteldemo.UpdateFlagRequest
-	39, // 44: oteldemo.FeatureFlagService.ListFlags:input_type -> oteldemo.ListFlagsRequest
-	41, // 45: oteldemo.FeatureFlagService.DeleteFlag:input_type -> oteldemo.DeleteFlagRequest
+	34, // 41: oteldemo.FeatureFlagService.GetFlag:input_type -> oteldemo.GetFlagRequest
+	36, // 42: oteldemo.FeatureFlagService.CreateFlag:input_type -> oteldemo.CreateFlagRequest
+	38, // 43: oteldemo.FeatureFlagService.UpdateFlagProbability:input_type -> oteldemo.UpdateFlagProbabilityRequest
+	40, // 44: oteldemo.FeatureFlagService.ListFlags:input_type -> oteldemo.ListFlagsRequest
+	42, // 45: oteldemo.FeatureFlagService.DeleteFlag:input_type -> oteldemo.DeleteFlagRequest
 	5,  // 46: oteldemo.CartService.AddItem:output_type -> oteldemo.Empty
 	4,  // 47: oteldemo.CartService.GetCart:output_type -> oteldemo.Cart
 	5,  // 48: oteldemo.CartService.EmptyCart:output_type -> oteldemo.Empty
@@ -2787,11 +2864,11 @@ var file_demo_proto_depIdxs = []int32{
 	5,  // 58: oteldemo.EmailService.SendOrderConfirmation:output_type -> oteldemo.Empty
 	28, // 59: oteldemo.CheckoutService.PlaceOrder:output_type -> oteldemo.PlaceOrderResponse
 	30, // 60: oteldemo.AdService.GetAds:output_type -> oteldemo.AdResponse
-	34, // 61: oteldemo.FeatureFlagService.GetFlag:output_type -> oteldemo.GetFlagResponse
-	36, // 62: oteldemo.FeatureFlagService.CreateFlag:output_type -> oteldemo.CreateFlagResponse
-	38, // 63: oteldemo.FeatureFlagService.UpdateFlag:output_type -> oteldemo.UpdateFlagResponse
-	40, // 64: oteldemo.FeatureFlagService.ListFlags:output_type -> oteldemo.ListFlagsResponse
-	42, // 65: oteldemo.FeatureFlagService.DeleteFlag:output_type -> oteldemo.DeleteFlagResponse
+	35, // 61: oteldemo.FeatureFlagService.GetFlag:output_type -> oteldemo.GetFlagResponse
+	37, // 62: oteldemo.FeatureFlagService.CreateFlag:output_type -> oteldemo.CreateFlagResponse
+	39, // 63: oteldemo.FeatureFlagService.UpdateFlagProbability:output_type -> oteldemo.UpdateFlagProbabilityResponse
+	41, // 64: oteldemo.FeatureFlagService.ListFlags:output_type -> oteldemo.ListFlagsResponse
+	43, // 65: oteldemo.FeatureFlagService.DeleteFlag:output_type -> oteldemo.DeleteFlagResponse
 	46, // [46:66] is the sub-list for method output_type
 	26, // [26:46] is the sub-list for method input_type
 	26, // [26:26] is the sub-list for extension type_name
@@ -3190,7 +3267,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[32].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Flag); i {
+			switch v := v.(*FlagEvaluationResult); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3202,7 +3279,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[33].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetFlagRequest); i {
+			switch v := v.(*FlagDefinition); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3214,7 +3291,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[34].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GetFlagResponse); i {
+			switch v := v.(*GetFlagRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3226,7 +3303,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[35].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CreateFlagRequest); i {
+			switch v := v.(*GetFlagResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3238,7 +3315,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[36].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CreateFlagResponse); i {
+			switch v := v.(*CreateFlagRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3250,7 +3327,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[37].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*UpdateFlagRequest); i {
+			switch v := v.(*CreateFlagResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3262,7 +3339,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[38].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*UpdateFlagResponse); i {
+			switch v := v.(*UpdateFlagProbabilityRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3274,7 +3351,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[39].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListFlagsRequest); i {
+			switch v := v.(*UpdateFlagProbabilityResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3286,7 +3363,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[40].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListFlagsResponse); i {
+			switch v := v.(*ListFlagsRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3298,7 +3375,7 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[41].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*DeleteFlagRequest); i {
+			switch v := v.(*ListFlagsResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3310,6 +3387,18 @@ func file_demo_proto_init() {
 			}
 		}
 		file_demo_proto_msgTypes[42].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DeleteFlagRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_demo_proto_msgTypes[43].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*DeleteFlagResponse); i {
 			case 0:
 				return &v.state
@@ -3328,7 +3417,7 @@ func file_demo_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_demo_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   43,
+			NumMessages:   44,
 			NumExtensions: 0,
 			NumServices:   10,
 		},
diff --git a/src/productcatalogservice/genproto/oteldemo/demo_grpc.pb.go b/src/productcatalogservice/genproto/oteldemo/demo_grpc.pb.go
index 2002dfbcdc..184b7696d3 100644
--- a/src/productcatalogservice/genproto/oteldemo/demo_grpc.pb.go
+++ b/src/productcatalogservice/genproto/oteldemo/demo_grpc.pb.go
@@ -15,7 +15,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.3.0
-// - protoc             v4.25.1
+// - protoc             v4.25.2
 // source: demo.proto
 
 package oteldemo
@@ -1065,11 +1065,11 @@ var AdService_ServiceDesc = grpc.ServiceDesc{
 }
 
 const (
-	FeatureFlagService_GetFlag_FullMethodName    = "/oteldemo.FeatureFlagService/GetFlag"
-	FeatureFlagService_CreateFlag_FullMethodName = "/oteldemo.FeatureFlagService/CreateFlag"
-	FeatureFlagService_UpdateFlag_FullMethodName = "/oteldemo.FeatureFlagService/UpdateFlag"
-	FeatureFlagService_ListFlags_FullMethodName  = "/oteldemo.FeatureFlagService/ListFlags"
-	FeatureFlagService_DeleteFlag_FullMethodName = "/oteldemo.FeatureFlagService/DeleteFlag"
+	FeatureFlagService_GetFlag_FullMethodName               = "/oteldemo.FeatureFlagService/GetFlag"
+	FeatureFlagService_CreateFlag_FullMethodName            = "/oteldemo.FeatureFlagService/CreateFlag"
+	FeatureFlagService_UpdateFlagProbability_FullMethodName = "/oteldemo.FeatureFlagService/UpdateFlagProbability"
+	FeatureFlagService_ListFlags_FullMethodName             = "/oteldemo.FeatureFlagService/ListFlags"
+	FeatureFlagService_DeleteFlag_FullMethodName            = "/oteldemo.FeatureFlagService/DeleteFlag"
 )
 
 // FeatureFlagServiceClient is the client API for FeatureFlagService service.
@@ -1078,7 +1078,7 @@ const (
 type FeatureFlagServiceClient interface {
 	GetFlag(ctx context.Context, in *GetFlagRequest, opts ...grpc.CallOption) (*GetFlagResponse, error)
 	CreateFlag(ctx context.Context, in *CreateFlagRequest, opts ...grpc.CallOption) (*CreateFlagResponse, error)
-	UpdateFlag(ctx context.Context, in *UpdateFlagRequest, opts ...grpc.CallOption) (*UpdateFlagResponse, error)
+	UpdateFlagProbability(ctx context.Context, in *UpdateFlagProbabilityRequest, opts ...grpc.CallOption) (*UpdateFlagProbabilityResponse, error)
 	ListFlags(ctx context.Context, in *ListFlagsRequest, opts ...grpc.CallOption) (*ListFlagsResponse, error)
 	DeleteFlag(ctx context.Context, in *DeleteFlagRequest, opts ...grpc.CallOption) (*DeleteFlagResponse, error)
 }
@@ -1109,9 +1109,9 @@ func (c *featureFlagServiceClient) CreateFlag(ctx context.Context, in *CreateFla
 	return out, nil
 }
 
-func (c *featureFlagServiceClient) UpdateFlag(ctx context.Context, in *UpdateFlagRequest, opts ...grpc.CallOption) (*UpdateFlagResponse, error) {
-	out := new(UpdateFlagResponse)
-	err := c.cc.Invoke(ctx, FeatureFlagService_UpdateFlag_FullMethodName, in, out, opts...)
+func (c *featureFlagServiceClient) UpdateFlagProbability(ctx context.Context, in *UpdateFlagProbabilityRequest, opts ...grpc.CallOption) (*UpdateFlagProbabilityResponse, error) {
+	out := new(UpdateFlagProbabilityResponse)
+	err := c.cc.Invoke(ctx, FeatureFlagService_UpdateFlagProbability_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -1142,7 +1142,7 @@ func (c *featureFlagServiceClient) DeleteFlag(ctx context.Context, in *DeleteFla
 type FeatureFlagServiceServer interface {
 	GetFlag(context.Context, *GetFlagRequest) (*GetFlagResponse, error)
 	CreateFlag(context.Context, *CreateFlagRequest) (*CreateFlagResponse, error)
-	UpdateFlag(context.Context, *UpdateFlagRequest) (*UpdateFlagResponse, error)
+	UpdateFlagProbability(context.Context, *UpdateFlagProbabilityRequest) (*UpdateFlagProbabilityResponse, error)
 	ListFlags(context.Context, *ListFlagsRequest) (*ListFlagsResponse, error)
 	DeleteFlag(context.Context, *DeleteFlagRequest) (*DeleteFlagResponse, error)
 	mustEmbedUnimplementedFeatureFlagServiceServer()
@@ -1158,8 +1158,8 @@ func (UnimplementedFeatureFlagServiceServer) GetFlag(context.Context, *GetFlagRe
 func (UnimplementedFeatureFlagServiceServer) CreateFlag(context.Context, *CreateFlagRequest) (*CreateFlagResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method CreateFlag not implemented")
 }
-func (UnimplementedFeatureFlagServiceServer) UpdateFlag(context.Context, *UpdateFlagRequest) (*UpdateFlagResponse, error) {
-	return nil, status.Errorf(codes.Unimplemented, "method UpdateFlag not implemented")
+func (UnimplementedFeatureFlagServiceServer) UpdateFlagProbability(context.Context, *UpdateFlagProbabilityRequest) (*UpdateFlagProbabilityResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method UpdateFlagProbability not implemented")
 }
 func (UnimplementedFeatureFlagServiceServer) ListFlags(context.Context, *ListFlagsRequest) (*ListFlagsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ListFlags not implemented")
@@ -1216,20 +1216,20 @@ func _FeatureFlagService_CreateFlag_Handler(srv interface{}, ctx context.Context
 	return interceptor(ctx, in, info, handler)
 }
 
-func _FeatureFlagService_UpdateFlag_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(UpdateFlagRequest)
+func _FeatureFlagService_UpdateFlagProbability_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(UpdateFlagProbabilityRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(FeatureFlagServiceServer).UpdateFlag(ctx, in)
+		return srv.(FeatureFlagServiceServer).UpdateFlagProbability(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: FeatureFlagService_UpdateFlag_FullMethodName,
+		FullMethod: FeatureFlagService_UpdateFlagProbability_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(FeatureFlagServiceServer).UpdateFlag(ctx, req.(*UpdateFlagRequest))
+		return srv.(FeatureFlagServiceServer).UpdateFlagProbability(ctx, req.(*UpdateFlagProbabilityRequest))
 	}
 	return interceptor(ctx, in, info, handler)
 }
@@ -1286,8 +1286,8 @@ var FeatureFlagService_ServiceDesc = grpc.ServiceDesc{
 			Handler:    _FeatureFlagService_CreateFlag_Handler,
 		},
 		{
-			MethodName: "UpdateFlag",
-			Handler:    _FeatureFlagService_UpdateFlag_Handler,
+			MethodName: "UpdateFlagProbability",
+			Handler:    _FeatureFlagService_UpdateFlagProbability_Handler,
 		},
 		{
 			MethodName: "ListFlags",