Add WorkerMetadata message to WorkerInitResponse

src/proto/FunctionRpc.proto

@@ -117,13 +117,35 @@ message WorkerInitRequest {
 
 // Worker responds with the result of initializing itself
 message WorkerInitResponse {
-  // Version of worker
+  // NOT USED
+  // TODO: Remove from protobuf during next breaking change release
   string worker_version = 1;
+
   // A map of worker supported features/capabilities
   map<string, string> capabilities = 2;
 
   // Status of the response
   StatusResult result = 3;
+
+  // Worker metadata captured for telemetry purposes
+  WorkerMetadata worker_metadata = 4;
+}
+
+message WorkerMetadata {
+  // The runtime/stack name
+  string runtime_name = 1;
+
+  // The version of the runtime/stack
+  string runtime_version = 2;
+
+  // The version of the worker
+  string worker_version = 3;
+
+  // The worker bitness/architecture
+  string worker_bitness = 4;
+
+  // Optional additional custom properties
+  map<string, string> custom_properties = 5;
 }
 
 // Used by the host to determine success/failure/cancellation
@@ -134,6 +156,7 @@ message StatusResult {
     Success = 1;
     Cancelled = 2;
   }
+
   // Status for the given result
   Status status = 4;