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statsd documentation

A basic page explaining how to have Zuul send metrics to statsd and the
metrics being exposed.

Change-Id: I3e767989a7bc46a1ed9083ecab60bfeeadcb6439
changes/85/49885/3
Antoine Musso 9 years ago
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a8eea7d354
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doc/source/index.rst

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launchers
reporters
zuul
statsd
Indices and tables
==================

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:title: 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: http://status.openstack.org/zuul/
Configuration
-------------
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 environnement variables STATSD_HOST and
STATSD_PORT. They are interpreted by the statsd module directly and there is no
such paremeter 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
STATSD_HOST=10.0.0.1
STATSD_PORT=8125
Metrics
-------
The metrics are emitted by the Zuul scheduler (`zuul/scheduler.py`):
**gerrit.events.<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.
**zuul.pipeline.**
Holds metrics specific to jobs. The hierarchy is:
#. **<pipeline name>** as defined in your `layout.yaml` file (ex: `gate`,
`test`, `publish`). It contains:
#. **all_jobs** counter of jobs triggered by the pipeline.
#. **current_changes** A gauge for the number of Gerrit changes being
processed by this pipeline.
#. **job** subtree detailing per jobs statistics:
#. **<jobname>** The triggered job name.
#. **<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.
#. **resident_time** timing representing how long the Change has been
known by Zuul (which includes build time and Zuul overhead).
#. **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
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