[serve] Noisy error message during normal shutdown

[edoakes]

Ctrl-C'd my serve run command and saw this:

(ServeController pid=56391) WARNING 2023-05-16 10:45:32,625 controller 56391 http_state.py:102 - Health check for HTTP proxy SERVE_CONTROLLER_ACTOR:SERVE_PROXY_ACTOR-f1564c78ef3ac287bed59b7fad94912313621ee0d3dbefd24d9afd00 failed: The actor died unexpectedly before finishing this task.
(ServeController pid=56391)     class_name: HTTPProxyActor
(ServeController pid=56391)     actor_id: d0fdc5293694dd9c71ced6e001000000
(ServeController pid=56391)     pid: 56397
(ServeController pid=56391)     name: SERVE_CONTROLLER_ACTOR:SERVE_PROXY_ACTOR-f1564c78ef3ac287bed59b7fad94912313621ee0d3dbefd24d9afd00
(ServeController pid=56391)     namespace: serve
(ServeController pid=56391)     ip: 127.0.0.1
(ServeController pid=56391) The actor is dead because it was killed by `ray.kill`.

Presumably introduced by: #34944

[zcin]

@edoakes Was this happening consistently?

[edoakes]

Not every time, but I saw it a few times within ~10 runs