46 lines
1.8 KiB
ReStructuredText
46 lines
1.8 KiB
ReStructuredText
==========================================
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Telemetry Data Collection service overview
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==========================================
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The Telemetry Data Collection services provide the following functions:
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* Efficiently polls metering data related to OpenStack services.
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* Collects event and metering data by monitoring notifications sent
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from services.
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* Publishes collected data to various targets including data stores and
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message queues.
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The Telemetry service consists of the following components:
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A compute agent (``ceilometer-agent-compute``)
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Runs on each compute node and polls for resource utilization
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statistics. This is actually the polling agent ``ceilometer-polling``
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running with parameter ``--polling-namespace compute``.
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A central agent (``ceilometer-agent-central``)
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Runs on a central management server to poll for resource utilization
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statistics for resources not tied to instances or compute nodes.
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Multiple agents can be started to scale service horizontally. This is
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actually the polling agent ``ceilometer-polling`` running with
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parameter ``--polling-namespace central``.
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A notification agent (``ceilometer-agent-notification``)
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Runs on a central management server(s) and consumes messages from
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the message queue(s) to build event and metering data. Data is then
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published to defined targets. By default, data is pushed to Gnocchi_.
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These services communicate by using the OpenStack messaging bus. Ceilometer
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data is designed to be published to various endpoints for storage and
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analysis.
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.. note::
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Ceilometer previously provided a storage and API solution. As of Newton,
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this functionality is officially deprecated and discouraged. For efficient
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storage and statistical analysis of Ceilometer data, Gnocchi_ is
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recommended.
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.. _Gnocchi: https://gnocchi.osci.io
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