Enable support for metrics collection with Prometheus via Micrometer

README.md

@@ -27,7 +27,8 @@ Features:
   and [/v3/api-docs](http://localhost:8123/v3/api-docs)
 - [Spring Actuator](https://docs.spring.io/spring-boot/reference/actuator/endpoints.html)
   at endpoint [/actuator](http://localhost:8123/actuator), e.g. for
-  [healthchecks](http://localhost:8123/actuator/health)
+  [healthchecks](http://localhost:8123/actuator/health) or [Prometheus
+  metrics](http://localhost:8123/actuator/prometheus)
 - Maven for build management (see [pom.xml](pom.xml)), using
   [Maven Wrapper](https://github.com/apache/maven-wrapper)
 - [GitHub Actions workflows](https://github.com/miguno/java-docker-build-tutorial/actions) for

pom.xml

@@ -57,6 +57,8 @@
         <maven.compiler.release>${java.version}</maven.compiler.release>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
+        <!-- Dependencies (other than Maven plugins) -->
+        <micrometer.version>1.13.3</micrometer.version>
         <!-- Maven plugins -->
         <maven-project-info-reports-plugin.version>3.7.0</maven-project-info-reports-plugin.version>
         <maven-enforcer-plugin.version>3.5.0</maven-enforcer-plugin.version>
@@ -104,6 +106,21 @@
             <artifactId>spring-boot-starter-actuator</artifactId>
         </dependency>
 
+        <dependency>
+            <!--
+                Exposes metrics via a Prometheus actuator endpoint.
+
+                Adds the following endpoint:
+                1. `/actuator/prometheus`
+
+                https://docs.spring.io/spring-boot/api/rest/actuator/prometheus.html#prometheus
+                https://docs.micrometer.io/micrometer/reference/implementations/prometheus.html
+            -->
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-registry-prometheus</artifactId>
+            <version>${micrometer.version}</version>
+        </dependency>
+
         <dependency>
             <!--
                 Integrates Spring Boot and Swagger UI.
@@ -118,6 +135,7 @@
             <version>${springdoc.version}</version>
         </dependency>
 
+
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-devtools</artifactId>