Add shutdown_worker_rejected field to poll responses

Add a bool field to PollWorkflowTaskQueueResponse, PollActivityTaskQueueResponse,
and PollNexusTaskQueueResponse to indicate when an empty poll response was caused
by the server rejecting the poll because the worker has been shut down via the
ShutdownWorker API.

Made-with: Cursor

Author: rkannan82

openapi/openapiv2.json

@@ -14580,6 +14580,10 @@
         "pollerScalingDecision": {
           "$ref": "#/definitions/v1PollerScalingDecision",
           "description": "Server-advised information the SDK may use to adjust its poller count."
+        },
+        "shutdownWorkerRejected": {
+          "type": "boolean",
+          "description": "When true, this empty response was caused by the server rejecting the poll\nbecause the worker has been shut down via the ShutdownWorker API. The SDK\nshould stop polling on this task queue."
         }
       }
     },

openapi/openapiv3.yaml

@@ -11640,6 +11640,12 @@ components:
           allOf:
             - $ref: '#/components/schemas/PollerScalingDecision'
           description: Server-advised information the SDK may use to adjust its poller count.
+        shutdownWorkerRejected:
+          type: boolean
+          description: |-
+            When true, this empty response was caused by the server rejecting the poll
+             because the worker has been shut down via the ShutdownWorker API. The SDK
+             should stop polling on this task queue.
     PollerInfo:
       type: object
       properties:

temporal/api/workflowservice/v1/request_response.proto

@@ -331,6 +331,10 @@ message PollWorkflowTaskQueueResponse {
     repeated temporal.api.protocol.v1.Message messages = 15;
     // Server-advised information the SDK may use to adjust its poller count.
     temporal.api.taskqueue.v1.PollerScalingDecision poller_scaling_decision = 16;
+    // When true, this empty response was caused by the server rejecting the poll
+    // because the worker has been shut down via the ShutdownWorker API. The SDK
+    // should stop polling on this task queue.
+    bool shutdown_worker_rejected = 17;
 }
 
 message RespondWorkflowTaskCompletedRequest {
@@ -516,6 +520,10 @@ message PollActivityTaskQueueResponse {
     temporal.api.common.v1.Priority priority = 19;
     // The run ID of the activity execution, only set for standalone activities.
     string activity_run_id = 20;
+    // When true, this empty response was caused by the server rejecting the poll
+    // because the worker has been shut down via the ShutdownWorker API. The SDK
+    // should stop polling on this task queue.
+    bool shutdown_worker_rejected = 21;
 }
 
 message RecordActivityTaskHeartbeatRequest {
@@ -1892,6 +1900,10 @@ message PollNexusTaskQueueResponse {
     temporal.api.nexus.v1.Request request = 2;
     // Server-advised information the SDK may use to adjust its poller count.
     temporal.api.taskqueue.v1.PollerScalingDecision poller_scaling_decision = 3;
+    // When true, this empty response was caused by the server rejecting the poll
+    // because the worker has been shut down via the ShutdownWorker API. The SDK
+    // should stop polling on this task queue.
+    bool shutdown_worker_rejected = 4;
 }
 
 message RespondNexusTaskCompletedRequest {