SIVA-1037 Add metrics endpoint for Prometheus

Author: rsarendus

siva-parent/siva-monitoring/pom.xml

@@ -49,6 +49,10 @@
             <artifactId>jcabi-manifests</artifactId>
             <version>${jcabi-manifests.version}</version>
         </dependency>
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-registry-prometheus</artifactId>
+        </dependency>
 
         <dependency>
             <groupId>org.projectlombok</groupId>

siva-parent/siva-webapp/src/main/resources/application.yml

@@ -8,6 +8,7 @@ management:
       exposure:
         include:
           - health
+          - prometheus
           # TODO: When Kubernetes is live, remove custom heartbeat endpoint if it is not used
           - heartbeat
           - version