feat: added EnterpriseConfig

feat: add a new cluster field for the cluster tier of GKE clusters

PiperOrigin-RevId: 578552799

google/container/v1/cluster_service.proto

@@ -1975,6 +1975,9 @@ message Cluster {
 
   // Beta APIs Config
   K8sBetaAPIConfig enable_k8s_beta_apis = 143;
+
+  // GKE Enterprise Configuration.
+  EnterpriseConfig enterprise_config = 149;
 }
 
 // K8sBetaAPIConfig , configuration for beta APIs
@@ -5288,3 +5291,22 @@ message ResourceManagerTags {
   // 3. `{project_id}/{tag_key_name}={tag_value_name}`
   map<string, string> tags = 1;
 }
+
+// EnterpriseConfig is the cluster enterprise configuration.
+message EnterpriseConfig {
+  // Premium tiers for GKE Cluster.
+  enum ClusterTier {
+    // CLUSTER_TIER_UNSPECIFIED is when cluster_tier is not set.
+    CLUSTER_TIER_UNSPECIFIED = 0;
+
+    // STANDARD indicates a standard GKE cluster.
+    STANDARD = 1;
+
+    // ENTERPRISE indicates a GKE Enterprise cluster.
+    ENTERPRISE = 2;
+  }
+
+  // Output only. [Output only] cluster_tier specifies the premium tier of the
+  // cluster.
+  ClusterTier cluster_tier = 1 [(google.api.field_behavior) = OUTPUT_ONLY];
+}