Fix configuration for Prometheus metrics

JVM related metrics were not being exposed due to spring boot bug
when loading beans configuration.

Issue-ID: POLICY-4146
Change-Id: I334c60b0c0d087c63b28bf44704aa3e909eca646
Signed-off-by: adheli.tavares <adheli.tavares@est.tech>

3 files changed, 45 insertions, 5 deletions

diff --git a/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/config/ConverterConfiguration.java b/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/config/ConverterConfiguration.java
index f51497266..6776e59a6 100644
--- a/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/config/ConverterConfiguration.java
+++ b/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/config/ConverterConfiguration.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021 Nordix Foundation.
+ *  Copyright (C) 2021-2022 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,7 +20,6 @@
 
 package org.onap.policy.clamp.acm.runtime.config;
 
-import java.util.Arrays;
 import java.util.List;
 import org.onap.policy.clamp.common.acm.rest.CoderHttpMesageConverter;
 import org.springframework.context.annotation.Configuration;
@@ -38,7 +37,7 @@ public class ConverterConfiguration implements WebMvcConfigurer {
         converters.add(new CoderHttpMesageConverter<>("json"));
 
         StringHttpMessageConverter converter = new StringHttpMessageConverter();
-        converter.setSupportedMediaTypes(Arrays.asList(MediaType.TEXT_PLAIN));
+        converter.setSupportedMediaTypes(List.of(MediaType.TEXT_PLAIN));
         converters.add(converter);
     }
 }
diff --git a/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/config/MetricsConfiguration.java b/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/config/MetricsConfiguration.java
new file mode 100644
index 000000000..dca31cdb8
--- /dev/null
+++ b/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/config/MetricsConfiguration.java
@@ -0,0 +1,40 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Nordix Foundation.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.clamp.acm.runtime.config;
+
+import io.micrometer.core.instrument.MeterRegistry;
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.config.BeanPostProcessor;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class MetricsConfiguration {
+
+    /**
+     * Load up the metrics registry.
+     */
+    @Bean
+    InitializingBean forcePrometheusPostProcessor(BeanPostProcessor meterRegistryPostProcessor,
+                                                  MeterRegistry registry) {
+        return () -> meterRegistryPostProcessor.postProcessAfterInitialization(registry, "");
+    }
+}
diff --git a/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/main/web/AbstractRestController.java b/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/main/web/AbstractRestController.java
index 7907de7be..107de58c9 100644
--- a/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/main/web/AbstractRestController.java
+++ b/runtime-acm/src/main/java/org/onap/policy/clamp/acm/runtime/main/web/AbstractRestController.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- * Copyright (C) 2021 Nordix Foundation.
+ * Copyright (C) 2021-2022 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,7 +34,8 @@ import org.springframework.web.bind.annotation.RequestMapping;
  * Common superclass to provide REST endpoints for the participant simulator.
  */
 // @formatter:off
-@RequestMapping(value = "/v2", produces = {MediaType.APPLICATION_JSON, AbstractRestController.APPLICATION_YAML})
+@RequestMapping(value = "/onap/policy/clamp/acm/v2",
+    produces = {MediaType.APPLICATION_JSON, AbstractRestController.APPLICATION_YAML})
 @Api(value = "Automation Composition Commissioning API")
 @SwaggerDefinition(
         info = @Info(description =