feat: Add KUBE_DNS option to DNSConfig.cluster_dns

---
feat: add Tier 1 cluster-level API network_performance_config
PiperOrigin-RevId: 544216853

google/container/v1/cluster_service.proto

@@ -2185,6 +2185,10 @@ message ClusterUpdate {
   // Enable/Disable Security Posture API features for the cluster.
   SecurityPostureConfig desired_security_posture_config = 124;
 
+  // The desired network performance config.
+  NetworkConfig.ClusterNetworkPerformanceConfig
+      desired_network_performance_config = 125;
+
   // Enable/Disable FQDN Network Policy for the cluster.
   optional bool desired_enable_fqdn_network_policy = 126;
 
@@ -4163,6 +4167,21 @@ message StatusCondition {
 
 // NetworkConfig reports the relative names of network & subnetwork.
 message NetworkConfig {
+  // Configuration of network bandwidth tiers
+  message ClusterNetworkPerformanceConfig {
+    // Node network tier
+    enum Tier {
+      // Default value
+      TIER_UNSPECIFIED = 0;
+
+      // Higher bandwidth, actual values based on VM size.
+      TIER_1 = 1;
+    }
+
+    // Specifies the total network bandwidth tier for NodePools in the cluster.
+    optional Tier total_egress_bandwidth_tier = 1;
+  }
+
   // Output only. The relative name of the Google Compute Engine
   // [network][google.container.v1.NetworkConfig.network](https://cloud.google.com/compute/docs/networks-and-firewalls#networks)
   // to which the cluster is connected. Example:
@@ -4208,6 +4227,9 @@ message NetworkConfig {
   // cluster.
   GatewayAPIConfig gateway_api_config = 16;
 
+  // Network bandwidth tier configuration.
+  ClusterNetworkPerformanceConfig network_performance_config = 18;
+
   // Whether FQDN Network Policy is enabled on this cluster.
   optional bool enable_fqdn_network_policy = 19;
 }
@@ -4444,6 +4466,9 @@ message DNSConfig {
 
     // Use CloudDNS for DNS resolution.
     CLOUD_DNS = 2;
+
+    // Use KubeDNS for DNS resolution
+    KUBE_DNS = 3;
   }
 
   // DNSScope lists the various scopes of access to cluster DNS records.