nixos/prometheus: add fallback_scrape_protocol and scrape_protocols o…

…ptions (NixOS#361223)

nixos/modules/services/monitoring/prometheus/default.nix

@@ -274,6 +274,7 @@ let
     };
   };
 
+  # https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config
   promTypes.scrape_config = types.submodule {
     options = {
       authorization = mkOption {
@@ -299,6 +300,15 @@ let
         globally configured default.
       '';
 
+      scrape_protocols = mkOpt (types.listOf types.str) ''
+        The protocols to negotiate during a scrape with the client.
+      '';
+
+      fallback_scrape_protocol = mkOpt types.str ''
+        Fallback protocol to use if a scrape returns blank, unparseable, or otherwise
+        invalid Content-Type.
+      '';
+
       metrics_path = mkDefOpt types.str "/metrics" ''
         The HTTP resource path on which to fetch metrics from targets.
       '';