docs: Update comment in Eventarc Publishing API

Google APIs · copybara-github · commit 3d9a46d77218 · 2025-10-01T09:13:24.000-07:00
PiperOrigin-RevId: 813779868
diff --git a/google/cloud/eventarc/publishing/v1/cloud_event.proto b/google/cloud/eventarc/publishing/v1/cloud_event.proto
@@ -90,6 +90,12 @@ message CloudEvent {
     string text_data = 7 [(google.api.field_behavior) = OPTIONAL];
 
     // Optional. Proto data.
+    //
+    // NOTE: The `protoData` field only functions as expected when the payload
+    // is specifically a `CloudEvent` message type, and can't be used for
+    // arbitrary protocol buffer messages. For any other protocol buffer type,
+    // you must serialize your proto message into bytes, and use the
+    // `binaryData` field instead.
     google.protobuf.Any proto_data = 8 [(google.api.field_behavior) = OPTIONAL];
   }
 }

Original file line number	Diff line number	Diff line change
`@@ -90,6 +90,12 @@ message CloudEvent {`
`90`	`90`	`string text_data = 7 [(google.api.field_behavior) = OPTIONAL];`
`91`	`91`
`92`	`92`	`// Optional. Proto data.`
	`93`	`+ //`
	`94`	+ // NOTE: The `protoData` field only functions as expected when the payload
	`95`	+ // is specifically a `CloudEvent` message type, and can't be used for
	`96`	`+ // arbitrary protocol buffer messages. For any other protocol buffer type,`
	`97`	`+ // you must serialize your proto message into bytes, and use the`
	`98`	+ // `binaryData` field instead.
`93`	`99`	`google.protobuf.Any proto_data = 8 [(google.api.field_behavior) = OPTIONAL];`
`94`	`100`	`}`
`95`	`101`	`}`