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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
  • delcounters - delete a counter or folder of counters
  • delgauges - delete a gauge or folder of gauges
  • deltimers - delete a timer or folder of timers
  • health - a way to set the health status of statsd

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

You can use the del commands to delete an individual metric like this :

#to delete counter sandbox.test.temporary
echo "delcounters sandbox.test.temporary" | nc 127.0.0.1 8126

Or you can use the del command to delete a folder of metrics like this :

#to delete counters sandbox.test.*
echo "delcounters sandbox.test.*" | nc 127.0.0.1 8126

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

Graphite:

  • graphite.last_flush: unix timestamp of last successful flush to graphite
  • graphite.last_exception: unix timestamp of 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.

The health output:

  • the health command alone allows you to see the current health status.
  • using health up or health down, you can change the current health status.
  • the healthStatus configuration option allows you to set the default health status at start.
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