The Gatekeeper, or a project gating system
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Statsd reporting

Statsd reporting

Zuul comes with support for the statsd protocol, when enabled and configured (see below), the Zuul scheduler will emit raw metrics to a statsd receiver which let you in turn generate nice graphics. An example is OpenStack Zuul status page:


Statsd support uses the statsd python module. Note that Zuul will start without the statsd python module, so an existing Zuul installation may be missing it.

The configuration is done via environment variables STATSD_HOST and STATSD_PORT. They are interpreted by the statsd module directly and there is no such parameter in zuul.conf yet. Your init script will have to initialize both of them before launching Zuul.

Your init script most probably loads a configuration file named /etc/default/zuul which would contain the environment variables:

$ cat /etc/default/zuul


The metrics are emitted by the Zuul scheduler (zuul/<type> (counters)

Gerrit emits different kind of message over its stream-events interface. As a convenience, Zuul emits metrics to statsd which save you from having to use a different daemon to measure Gerrit events. The Gerrit events have different types defined by Gerrit itself, Zuul will relay any type of event reusing the name defined by Gerrit. Some of the events emitted are:

  • patchset-created
  • draft-published
  • change-abandonned
  • change-restored
  • change-merged
  • merge-failed
  • comment-added
  • ref-updated
  • reviewer-added

Refer to your Gerrit installation documentation for an exhaustive list of Gerrit event types.


Holds metrics specific to jobs. The hierarchy is:

  1. <pipeline name> as defined in your layout.yaml file (ex: gate,

    test, publish). It contains:

  1. all_jobs counter of jobs triggered by the pipeline.
  2. current_changes A gauge for the number of Gerrit changes being

    processed by this pipeline.

  3. job subtree detailing per jobs statistics:
  1. <jobname> The triggered job name.
  2. <build result> Result as defined in your triggering system. For

    Jenkins that would be SUCCESS, FAILURE, UNSTABLE, LOST. The metrics holds both an increasing counter and a timing reporting the duration of the build. Whenever the result is a SUCCESS or FAILURE, Zuul will additionally report the duration of the build as a timing event.

  1. resident_time timing representing how long the Change has been

    known by Zuul (which includes build time and Zuul overhead).

  2. total_changes counter of the number of change proceeding since

    Zuul started.

Additionally, the zuul.pipeline.<pipeline name> hierarchy contains current_changes and resident_time metrics for each projects. The slash separator used in Gerrit name being replaced by dots.

As an example, given a job named myjob triggered by the gate pipeline which took 40 seconds to build, the Zuul scheduler will emit the following statsd events:

  • zuul.pipeline.gate.job.myjob.SUCCESS +1
  • zuul.pipeline.gate.job.myjob 40 seconds
  • zuul.pipeline.gate.all_jobs +1