fix: keep example hello world deployment's output deterministic for testing (#1051)

examples/hello_world/hello_world.py

@@ -14,7 +14,6 @@
 # limitations under the License.
 
 import logging
-import os
 
 from fastapi.responses import StreamingResponse
 from pydantic import BaseModel
@@ -78,7 +77,7 @@ class Backend:
         logger.info(f"Backend received: {req_text}")
         text = f"{req_text}-{self.message}"
         for token in text.split():
-            yield f"[process_id:{os.getpid()}] Backend: {token}"
+            yield f"Backend: {token}"
 
 
 @service(
@@ -103,7 +102,7 @@ class Middle:
         next_request = RequestType(text=text).model_dump_json()
         async for response in self.backend.generate(next_request):
             logger.info(f"Middle received response: {response}")
-            yield f"[process_id:{os.getpid()}] Middle: {response}"
+            yield f"Middle: {response}"
 
 
 @service(
@@ -134,6 +133,6 @@ class Frontend:
 
         async def content_generator():
             async for response in self.middle.generate(request.model_dump_json()):
-                yield f"[process_id:{os.getpid()}] Frontend: {response}"
+                yield f"Frontend: {response}"
 
         return StreamingResponse(content_generator())