[FLINK-34429][flink-kubernetes] Setting annotations on internal service.

[FLINK-34429][docs] Updating configuration to include kubernetes.internal-service.annotations key.

[FLINK-34429][flink-kubernetes] Kubernetes side parameters utility to retrieve INTERNAL_SERVICE_ANNOTATIONS from configuration

[FLINK-34429][flink-kubernetes] Test for pulling Internal-Service Annotations parameter (KubernetesJobManagerParameters)

[FLINK-34429][flink-kubernetes] Testing that internal-service is created with configured annotations

docs/layouts/shortcodes/generated/kubernetes_config_configuration.html

@@ -110,6 +110,12 @@
             <td>Boolean</td>
             <td>Whether to enable HostNetwork mode. The HostNetwork allows the pod could use the node network namespace instead of the individual pod network namespace. Please note that the JobManager service account should have the permission to update Kubernetes service.</td>
         </tr>
+        <tr>
+            <td><h5>kubernetes.internal-service.annotations</h5></td>
+            <td style="word-wrap: break-word;">(none)</td>
+            <td>Map</td>
+            <td>The user-specified annotations that are set to the internal Service. The value should be in the form of a1:v1,a2:v2</td>
+        </tr>
         <tr>
             <td><h5>kubernetes.jobmanager.annotations</h5></td>
             <td style="word-wrap: break-word;">(none)</td>

flink-kubernetes/src/main/java/org/apache/flink/kubernetes/configuration/KubernetesConfigOptions.java

@@ -377,6 +377,14 @@ public class KubernetesConfigOptions {
                             "The user-specified annotations that are set to the rest Service. The value should be "
                                     + "in the form of a1:v1,a2:v2");
 
+    public static final ConfigOption<Map<String, String>> INTERNAL_SERVICE_ANNOTATIONS =
+            key("kubernetes.internal-service.annotations")
+                    .mapType()
+                    .noDefaultValue()
+                    .withDescription(
+                            "The user-specified annotations that are set to the internal Service. The value should be "
+                                    + "in the form of a1:v1,a2:v2");
+
     /**
      * Defines the configuration key of that external resource in Kubernetes. This is used as a
      * suffix in an actual config.

flink-kubernetes/src/main/java/org/apache/flink/kubernetes/kubeclient/parameters/KubernetesJobManagerParameters.java

@@ -118,6 +118,12 @@ public Map<String, String> getRestServiceAnnotations() {
                 .orElse(Collections.emptyMap());
     }
 
+    public Map<String, String> getInternalServiceAnnotations() {
+        return flinkConfig
+                .getOptional(KubernetesConfigOptions.INTERNAL_SERVICE_ANNOTATIONS)
+                .orElse(Collections.emptyMap());
+    }
+
     public int getJobManagerMemoryMB() {
         return clusterSpecification.getMasterMemoryMB();
     }

flink-kubernetes/src/main/java/org/apache/flink/kubernetes/kubeclient/services/HeadlessClusterIPService.java

@@ -50,6 +50,7 @@ public Service buildUpInternalService(
                 .withNewMetadata()
                 .withName(serviceName)
                 .withLabels(kubernetesJobManagerParameters.getCommonLabels())
+                .withAnnotations(kubernetesJobManagerParameters.getInternalServiceAnnotations())
                 .endMetadata()
                 .withNewSpec()
                 .withClusterIP(HEADLESS_CLUSTER_IP)

flink-kubernetes/src/test/java/org/apache/flink/kubernetes/kubeclient/KubernetesJobManagerTestBase.java

@@ -63,6 +63,7 @@ protected void setupFlinkConfig() {
                                 ResourceManagerOptions.CONTAINERIZED_MASTER_ENV_PREFIX + k, v));
         this.flinkConfig.set(KubernetesConfigOptions.JOB_MANAGER_LABELS, userLabels);
         this.flinkConfig.set(KubernetesConfigOptions.JOB_MANAGER_ANNOTATIONS, userAnnotations);
+        this.flinkConfig.set(KubernetesConfigOptions.INTERNAL_SERVICE_ANNOTATIONS, userAnnotations);
         this.flinkConfig.set(KubernetesConfigOptions.JOB_MANAGER_NODE_SELECTOR, nodeSelector);
         this.flinkConfig.set(
                 JobManagerOptions.TOTAL_PROCESS_MEMORY, MemorySize.ofMebiBytes(JOB_MANAGER_MEMORY));

flink-kubernetes/src/test/java/org/apache/flink/kubernetes/kubeclient/decorators/InternalServiceDecoratorTest.java

@@ -69,6 +69,8 @@ void testBuildAccompanyingKubernetesResources() throws IOException {
         final Map<String, String> expectedLabels = getCommonLabels();
         assertThat(internalService.getMetadata().getLabels()).isEqualTo(expectedLabels);
 
+        assertThat(internalService.getMetadata().getAnnotations()).isEqualTo(userAnnotations);
+
         assertThat(internalService.getSpec().getType()).isNull();
         assertThat(internalService.getSpec().getClusterIP()).isEqualTo("None");
 

flink-kubernetes/src/test/java/org/apache/flink/kubernetes/kubeclient/parameters/KubernetesJobManagerParametersTest.java

@@ -96,7 +96,7 @@ void testGetJobManagerAnnotations() {
     }
 
     @Test
-    void testGetServiceAnnotations() {
+    void testGetRestServiceAnnotations() {
         final Map<String, String> expectedAnnotations = new HashMap<>();
         expectedAnnotations.put("a1", "v1");
         expectedAnnotations.put("a2", "v2");
@@ -109,6 +109,20 @@ void testGetServiceAnnotations() {
         assertThat(resultAnnotations).isEqualTo(expectedAnnotations);
     }
 
+    @Test
+    void testGetInternalServiceAnnotations() {
+        final Map<String, String> expectedAnnotations = new HashMap<>();
+        expectedAnnotations.put("a1", "v1");
+        expectedAnnotations.put("a2", "v2");
+
+        flinkConfig.set(KubernetesConfigOptions.INTERNAL_SERVICE_ANNOTATIONS, expectedAnnotations);
+
+        final Map<String, String> resultAnnotations =
+                kubernetesJobManagerParameters.getInternalServiceAnnotations();
+
+        assertThat(resultAnnotations).isEqualTo(expectedAnnotations);
+    }
+
     @Test
     void testGetJobManagerMemoryMB() {
         assertThat(kubernetesJobManagerParameters.getJobManagerMemoryMB())