Add region_id to ComputeConfigScalingGroup (#875)

<!-- Describe what has changed in this PR -->
**What changed?**
Adds an optional `region_id` field to `ComputeConfigScalingGroup`. When
set, the scaling group is used only while the namespace is active in
that region. When empty, the scaling group is used as the default, so
existing configurations behave exactly as before.

<!-- Tell your future self why have you made these changes -->
**Why?**
This is to let users configure region specific compute on a Worker
Deployment Version. The Worker Controller Instance can then invoke the
compute that is set for the namespace's active region, so serverless
workers follow the namespace through a failover.


<!-- Are there any breaking changes on binary or code level? -->
**Breaking changes**
none

<!-- If this breaks the Server, please provide the Server PR to merge
right after this PR was merged. -->
**Server PR**
none

Author: mani-j9

openapi/openapiv2.json

@@ -15134,6 +15134,13 @@
           },
           "description": "Optional. The set of task queue types this scaling group serves.\nIf not provided, this scaling group serves all not otherwise defined\ntask types."
         },
+        "regionIds": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "description": "Optional. If set, this scaling group is used only while the namespace is\nactive in one of these regions."
+        },
         "provider": {
           "$ref": "#/definitions/v1ComputeProvider",
           "description": "Stores instructions for a worker control plane controller how to respond\nto worker lifeycle events."
@@ -15155,6 +15162,12 @@
         },
         "providerType": {
           "type": "string"
+        },
+        "regionIds": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
         }
       }
     },
@@ -15166,7 +15179,7 @@
         },
         "updateMask": {
           "type": "string",
-          "title": "Controls which fields from `scaling_group` will be applied. Semantics:\n- Mask is ignored for new scaling groups (only applicable when scaling group already exists).\n- Empty mask for an existing scaling group is no-op: no change.\n- Non-empty mask for an existing scaling group will update/unset only to the fields\n  mentioned in the mask.\n- Accepted paths: \"task_queue_types\", \"provider\", \"provider.type\", \"provider.details\",\n  \"provider.nexus_endpoint\", \"scaler\", \"scaler.type\", \"scaler.details\""
+          "title": "Controls which fields from `scaling_group` will be applied. Semantics:\n- Mask is ignored for new scaling groups (only applicable when scaling group already exists).\n- Empty mask for an existing scaling group is no-op: no change.\n- Non-empty mask for an existing scaling group will update/unset only to the fields\n  mentioned in the mask.\n- Accepted paths: \"task_queue_types\", \"region_ids\", \"provider\", \"provider.type\", \"provider.details\",\n  \"provider.nexus_endpoint\", \"scaler\", \"scaler.type\", \"scaler.details\""
         }
       }
     },

openapi/openapiv3.yaml

@@ -11249,6 +11249,13 @@ components:
             Optional. The set of task queue types this scaling group serves.
              If not provided, this scaling group serves all not otherwise defined
              task types.
+        regionIds:
+          type: array
+          items:
+            type: string
+          description: |-
+            Optional. If set, this scaling group is used only while the namespace is
+             active in one of these regions.
         provider:
           allOf:
             - $ref: '#/components/schemas/ComputeProvider'
@@ -11276,6 +11283,10 @@ components:
             format: enum
         providerType:
           type: string
+        regionIds:
+          type: array
+          items:
+            type: string
     ComputeConfigScalingGroupUpdate:
       type: object
       properties:
@@ -11289,7 +11300,7 @@ components:
              - Empty mask for an existing scaling group is no-op: no change.
              - Non-empty mask for an existing scaling group will update/unset only to the fields
                mentioned in the mask.
-             - Accepted paths: "task_queue_types", "provider", "provider.type", "provider.details",
+             - Accepted paths: "task_queue_types", "region_ids", "provider", "provider.type", "provider.details",
                "provider.nexus_endpoint", "scaler", "scaler.type", "scaler.details"
           format: field-mask
     ComputeConfigSummary:

temporal/api/compute/v1/config.proto

@@ -20,6 +20,10 @@ message ComputeConfigScalingGroup {
     // task types.
     repeated temporal.api.enums.v1.TaskQueueType task_queue_types = 1;
 
+    // Optional. If set, this scaling group is used only while the namespace is
+    // active in one of these regions.
+    repeated string region_ids = 2;
+
     // Stores instructions for a worker control plane controller how to respond
     // to worker lifeycle events.
     temporal.api.compute.v1.ComputeProvider provider = 3;
@@ -52,7 +56,7 @@ message ComputeConfigScalingGroupUpdate {
   // - Empty mask for an existing scaling group is no-op: no change.
   // - Non-empty mask for an existing scaling group will update/unset only to the fields
   //   mentioned in the mask.
-  // - Accepted paths: "task_queue_types", "provider", "provider.type", "provider.details",
+  // - Accepted paths: "task_queue_types", "region_ids", "provider", "provider.type", "provider.details",
   //   "provider.nexus_endpoint", "scaler", "scaler.type", "scaler.details"
   google.protobuf.FieldMask update_mask = 2;
 }
@@ -65,4 +69,5 @@ message ComputeConfigSummary {
 message ComputeConfigScalingGroupSummary {
     repeated temporal.api.enums.v1.TaskQueueType task_queue_types = 1;
     string provider_type = 2;
+    repeated string region_ids = 3;
 }