103 lines
3.9 KiB
ReStructuredText
103 lines
3.9 KiB
ReStructuredText
.. _metrics:
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=========================
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Emitting Software Metrics
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=========================
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Beginning with the Newton (6.1.0) release, the ironic services support
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emitting internal performance data to
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`statsd <https://github.com/etsy/statsd>`_. This allows operators to graph
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and understand performance bottlenecks in their system.
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This guide assumes you have a statsd server setup. For information on using
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and configuring statsd, please see the
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`statsd <https://github.com/etsy/statsd>`_ README and documentation.
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These performance measurements, herein referred to as "metrics", can be
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emitted from the Bare Metal service, including ironic-api, ironic-conductor,
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and ironic-python-agent. By default, none of the services will emit metrics.
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Configuring the Bare Metal Service to Enable Metrics
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====================================================
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Enabling metrics in ironic-api and ironic-conductor
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---------------------------------------------------
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The ironic-api and ironic-conductor services can be configured to emit metrics
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to statsd by adding the following to the ironic configuration file, usually
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located at ``/etc/ironic/ironic.conf``::
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[metrics]
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backend = statsd
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If a statsd daemon is installed and configured on every host running an ironic
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service, listening on the default UDP port (8125), no further configuration is
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needed. If you are using a remote statsd server, you must also supply
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connection information in the ironic configuration file::
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[metrics_statsd]
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# Point this at your environments' statsd host
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statsd_host = 192.0.2.1
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statsd_port = 8125
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Enabling metrics in ironic-python-agent
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---------------------------------------
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The ironic-python-agent process receives its configuration in the response from
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the initial lookup request to the ironic-api service. This means to configure
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ironic-python-agent to emit metrics, you must enable the agent metrics backend
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in your ironic configuration file on all ironic-conductor hosts::
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[metrics]
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agent_backend = statsd
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In order to reliably emit metrics from the ironic-python-agent, you must
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provide a statsd server that is reachable from both the configured provisioning
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and cleaning networks. The agent statsd connection information is configured
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in the ironic configuration file as well::
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[metrics_statsd]
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# Point this at a statsd host reachable from the provisioning and cleaning nets
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agent_statsd_host = 198.51.100.2
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agent_statsd_port = 8125
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Types of Metrics Emitted
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========================
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The Bare Metal service emits timing metrics for every API method, as well as
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for most driver methods. These metrics measure how long a given method takes
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to execute.
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A deployer with metrics enabled should expect between 100 and 500 distinctly
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named data points to be emitted from the Bare Metal service. This will
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increase if the metrics.preserve_host option is set to true or if multiple
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drivers are used in the Bare Metal deployment. This estimate may be used to
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determine if a deployer needs to scale their metrics backend to handle the
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additional load before enablng metrics.
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.. note::
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With the default statsd configuration, each timing metric may create
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additional metrics due to how statsd handles timing metrics. For more
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information, see statds documentation on
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`metric types <https://github.com/etsy/statsd/blob/master/docs/metric_types.md#timing>`_.
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The ironic-python-agent ramdisk emits timing metrics for every API method.
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Deployers who use custom HardwareManagers can emit custom metrics for their
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hardware. For more information on custom HardwareManagers, and emitting
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metrics from them, please see the
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`ironic-python-agent documentation <http://docs.openstack.org/developer/ironic-python-agent/>`_.
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Adding New Metrics
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==================
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If you're a developer, and would like to add additional metrics to ironic,
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please see the ironic-lib developer documentation for details on how to use
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the metrics library.
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.. TODO::
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Link to ironic-lib developer documentation once it's published.
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