Don't enable health check server on OSS-Fuzz. (#2640)

Author: oliverchang

src/python/bot/startup/health_check_responder.py

@@ -19,6 +19,7 @@
 from http.server import HTTPServer
 import threading
 
+from clusterfuzz._internal.base import utils
 from clusterfuzz._internal.system import process_handler
 
 RESPONDER_IP = '0.0.0.0'
@@ -45,6 +46,10 @@ def do_GET(self):  # pylint: disable=invalid-name
 
 def run_server():
   """Start a HTTP server to respond to the health checker."""
+  if utils.is_oss_fuzz():
+    # OSS-Fuzz's multiple instances per host model isn't supported yet.
+    return
+
   health_check_responder_server = HTTPServer((RESPONDER_IP, RESPONDER_PORT),
                                              RequestHandler)
   server_thread = threading.Thread(