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TCP Stats Interface

A really simple TCP management interface is available by default on port 8126 or overriden in the configuration file. Inspired by the memcache stats approach this can be used to monitor a live statsd server. You can interact with the management server by telnetting to port 8126, the following commands are available:

  • stats - some stats about the running server
  • counters - a dump of all the current counters
  • gauges - a dump of all the current gauges
  • timers - a dump of the current timers

The stats output currently will give you:

  • uptime: the number of seconds elapsed since statsd started
  • messages.last_msg_seen: the number of elapsed seconds since statsd received a message
  • messages.bad_lines_seen: the number of bad lines seen since startup

Each backend will also publish a set of statistics, prefixed by its module name.

You can use this to delete buckets no longer in use. For example, if you were hosting statsd at 10.10.10.10:

#to delete counter sandbox.test.temporary
echo "delcounters sandbox.test.temporary" | nc 10.10.10.10 8126

Graphite:

  • graphite.last_flush: the number of seconds elapsed since the last successful flush to graphite
  • graphite.last_exception: the number of seconds elapsed since the last exception thrown whilst flushing to graphite
  • graphite.flush_length: the length of the string sent to graphite
  • graphite.flush_time: the time it took to send the data to graphite

Those statistics will also be sent to graphite under the namespaces stats.statsd.graphiteStats.last_exception and stats.statsd.graphiteStats.last_flush.

A simple nagios check can be found in the utils/ directory that can be used to check metric thresholds, for example the number of seconds since the last successful flush to graphite.

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