Make Buildbot masters send ts_mon metrics, and add standard HTTP server metrics.

masters/buildbot.tac

 # Copyright 2016 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.
 
 """Common twistd configuration for buildbot.
 
 Use this with:
   twistd -y buildbot.tac -d path/to/master
 """
 
+import argparse
+import logging
 import os
 
+from buildbot.master import BuildMaster
+from infra_libs import ts_mon
 from twisted.application import service
-from buildbot.master import BuildMaster
+
+
+def setup_timeseries_monitoring():
+  logging.basicConfig(level=logging.INFO)
+
+  parser = argparse.ArgumentParser()
+  ts_mon.add_argparse_options(parser)
+  parser.set_defaults(
+      ts_mon_target_type='task',
+      ts_mon_task_service_name='buildmaster',
+      ts_mon_task_job_name=os.path.basename(os.getcwd()),
+      # Flushing is done by a PollingChangeSource.  Using 'auto' here doesn't
+      # work because the thread doesn't get forked along with the rest of the
+      # process by twistd.
+      ts_mon_flush='manual',
+  )
+  args = parser.parse_args([])
+  ts_mon.process_argparse_options(args)
+
 
 application = service.Application('buildmaster')
 BuildMaster(os.getcwd(), 'master.cfg').setServiceParent(application)
+setup_timeseries_monitoring()