send_monitoring_event: support for default event and gomastats

infra/tools/send_monitoring_event/__main__.py

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import logging
 import sys
 import traceback
 
 import infra_libs.event_mon as event_mon
 import infra_libs.ts_mon as ts_mon
 
 from infra.tools.send_monitoring_event import send_event
 
 
 def main(argv):  # pragma: no cover
   # Does nothing when no arguments are passed, to make it safe to import this
   # module (main() is executed on import, because this file is called __main__).
   status = 0
 
   if len(argv) == 0:
     return status
 
   success_metric = ts_mon.BooleanMetric('send_monitoring_event/success')
 
   try:
     args = send_event.get_arguments(argv)
-
     send_event.process_argparse_options(args)
 
     if args.build_event_type:
       success_metric.set(send_event.send_build_event(args))
 
     elif args.service_event_type:
       success_metric.set(send_event.send_service_event(args))
 
     elif args.events_from_file:
       success_metric.set(send_event.send_events_from_file(args))
 
     else:
       print >> sys.stderr, ('At least one of the --*-event-type options or '
                             '--events-from-file should be provided. Nothing '
                             'was sent.')
       status = 2
       success_metric.set(False)
   except Exception:
     success_metric.set(False)
     traceback.print_exc()  # helps with debugging locally.
   finally:
     event_mon.close()
     try:
       ts_mon.flush()
     except ts_mon.MonitoringNoConfiguredMonitorError:
-      pass
+      logging.error("Unable to flush ts_mon because it's not configured.")
+    except Exception:
+      logging.exception("Flushing ts_mon metrics failed.")
   return status
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))