Support prometheus metrics

- add micrometer-registry-prometheus dep and
  test that /actuator/prometheus endpoint is available

Issue-ID: SO-4231
Change-Id: I6010dbf3caa556c64db16bc912730e1318afe539
Signed-off-by: Fiete Ostkamp <Fiete.Ostkamp@telekom.de>

diff --git a/so-cnf-adapter-application/pom.xml b/so-cnf-adapter-application/pom.xml
index c11eedd..489f84b 100755 (executable)
--- a/so-cnf-adapter-application/pom.xml
+++ b/so-cnf-adapter-application/pom.xml
@@ -158,6 +158,10 @@
       <groupId>org.apache.cxf</groupId>
       <artifactId>cxf-spring-boot-starter-jaxrs</artifactId>
     </dependency>
+    <dependency>
+        <groupId>io.micrometer</groupId>
+        <artifactId>micrometer-registry-prometheus</artifactId>
+    </dependency>
     <dependency>
       <groupId>org.apache.httpcomponents</groupId>
       <artifactId>httpmime</artifactId>

diff --git a/so-cnf-adapter-application/src/test/java/org/onap/so/adapters/cnf/rest/MetricsTest.java b/so-cnf-adapter-application/src/test/java/org/onap/so/adapters/cnf/rest/MetricsTest.java
new file mode 100644 (file)
index 0000000..94530c7
--- /dev/null
+++ b/so-cnf-adapter-application/src/test/java/org/onap/so/adapters/cnf/rest/MetricsTest.java
@@ -0,0 +1,54 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * Copyright (C) 2025 Deutsche Telekom. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.so.adapters.cnf.rest;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import static org.hamcrest.Matchers.containsString;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+
+@SpringBootTest(properties = {
+  "management.metrics.export.prometheus.enabled=true",
+  "management.endpoints.web.exposure.include=prometheus",
+  "management.endpoint.prometheus.enabled=true",
+})
+@AutoConfigureMockMvc
+@RunWith(SpringRunner.class)
+public class MetricsTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    public void prometheusEndpointShouldReturnMetrics() throws Exception {
+        mockMvc.perform(get("/actuator/prometheus"))
+               .andExpect(status().isOk())  // HTTP 200 OK
+               .andExpect(content().string(containsString("# HELP"))); // Prometheus metrics contain HELP header comments
+    }
+}