add unset_versioning_override to WorkflowExecutionOptionsUpdatedEventAttributes

openapi/openapiv2.json

@@ -13077,7 +13077,11 @@
       "properties": {
         "versioningOverride": {
           "$ref": "#/definitions/v1VersioningOverride",
-          "description": "Versioning override in the mutable state after event has been applied."
+          "description": "Versioning override upserted in this event.\nIgnored if nil or if unset_versioning_override is true."
+        },
+        "unsetVersioningOverride": {
+          "type": "boolean",
+          "description": "Versioning override removed in this event."
         }
       }
     },

openapi/openapiv3.yaml

@@ -10572,7 +10572,12 @@ components:
         versioningOverride:
           allOf:
             - $ref: '#/components/schemas/VersioningOverride'
-          description: Versioning override in the mutable state after event has been applied.
+          description: |-
+            Versioning override upserted in this event.
+             Ignored if nil or if unset_versioning_override is true.
+        unsetVersioningOverride:
+          type: boolean
+          description: Versioning override removed in this event.
     WorkflowExecutionSignaledEventAttributes:
       type: object
       properties:

temporal/api/history/v1/message.proto

@@ -741,8 +741,11 @@ message ChildWorkflowExecutionTerminatedEventAttributes {
 }
 
 message WorkflowExecutionOptionsUpdatedEventAttributes {
-    // Versioning override in the mutable state after event has been applied.
+    // Versioning override upserted in this event.
+    // Ignored if nil or if unset_versioning_override is true.
     temporal.api.workflow.v1.VersioningOverride versioning_override = 1;
+    // Versioning override removed in this event.
+    bool unset_versioning_override = 2;
 }
 
 // Not used anywhere. Use case is replaced by WorkflowExecutionOptionsUpdatedEventAttributes