feat: Add isolation support to prevent cross-region overflow by adding a new field "isolation_config" to message "ServiceLbPolicy"

Google APIs · copybara-github · commit 6fde4a5ed2c1 · 2025-07-07T14:30:21.000-07:00
PiperOrigin-RevId: 780262024
diff --git a/google/cloud/networkservices/v1/service_lb_policy.proto b/google/cloud/networkservices/v1/service_lb_policy.proto
@@ -61,6 +61,17 @@ message ServiceLbPolicy {
         [(google.api.field_behavior) = OPTIONAL];
   }
 
+  // Configuration to provide isolation support for the associated Backend
+  // Service.
+  message IsolationConfig {
+    // Optional. The isolation granularity of the load balancer.
+    IsolationGranularity isolation_granularity = 1
+        [(google.api.field_behavior) = OPTIONAL];
+
+    // Optional. The isolation mode of the load balancer.
+    IsolationMode isolation_mode = 2 [(google.api.field_behavior) = OPTIONAL];
+  }
+
   // The global load balancing algorithm to be used.
   enum LoadBalancingAlgorithm {
     // The type of the loadbalancing algorithm is unspecified.
@@ -86,6 +97,30 @@ message ServiceLbPolicy {
     WATERFALL_BY_ZONE = 6;
   }
 
+  // The granularity of this isolation restriction.
+  enum IsolationGranularity {
+    // No isolation is configured for the backend service. Traffic can overflow
+    // based on the load balancing algorithm.
+    ISOLATION_GRANULARITY_UNSPECIFIED = 0;
+
+    // Traffic for this service will be isolated at the cloud region level.
+    REGION = 1;
+  }
+
+  // The mode of this isolation restriction, defining whether clients in a given
+  // region are allowed to reach out to another region.
+  enum IsolationMode {
+    // No isolation mode is configured for the backend service.
+    ISOLATION_MODE_UNSPECIFIED = 0;
+
+    // Traffic will be sent to the nearest region.
+    NEAREST = 1;
+
+    // Traffic will fail if no serving backends are available in the same region
+    // as the load balancer.
+    STRICT = 2;
+  }
+
   // Identifier. Name of the ServiceLbPolicy resource. It matches pattern
   // `projects/{project}/locations/{location}/serviceLbPolicies/{service_lb_policy_name}`.
   string name = 1 [(google.api.field_behavior) = IDENTIFIER];
@@ -117,6 +152,11 @@ message ServiceLbPolicy {
 
   // Optional. Configuration related to health based failover.
   FailoverConfig failover_config = 10 [(google.api.field_behavior) = OPTIONAL];
+
+  // Optional. Configuration to provide isolation support for the associated
+  // Backend Service.
+  IsolationConfig isolation_config = 11
+      [(google.api.field_behavior) = OPTIONAL];
 }
 
 // Request used with the ListServiceLbPolicies method.
