Cloudlog: cleanup zmq cloudlog warnings (#28896)

* Laikad: cleanup zmq cloudlog warnings

* Handle in cloudlog

* whitespace

* whitespace

* suppress before reconnecting in thread
old-commit-hash: 8f3037c956343453957571b61cfd1c3063cbbbab

system/swaglog.py

@@ -1,6 +1,7 @@
 import logging
 import os
 import time
+import warnings
 from pathlib import Path
 from logging.handlers import BaseRotatingHandler
 
@@ -90,6 +91,8 @@ class UnixDomainSocketHandler(logging.Handler):
 
   def emit(self, record):
     if os.getpid() != self.pid:
+      # TODO suppresses warning about forking proc with zmq socket, fix root cause
+      warnings.filterwarnings("ignore", category=ResourceWarning, message="unclosed.*<zmq.*>")
       self.connect()
 
     msg = self.format(record).rstrip('\n')