Added information for missing Telemtry services.
Added some basic (minimalistic) information about the rest of the Telemtry-based services that had no listing prior. Change-Id: Icbb6cde0b3723b00e9bc0121265ba24d8033b77b Closes-Bug: 1371004
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@ -39,7 +39,7 @@
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<listitem><para>Runs on each compute node and polls for resource
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utilization statistics. There may be other types of agents in the
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future, but for now our focus is creating the compute agent.</para>
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</listitem>
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</listitem>
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</varlistentry>
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<varlistentry><term>A central agent (<systemitem class="service"
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>ceilometer-agent-central</systemitem>)</term>
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@ -47,6 +47,12 @@
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resource utilization statistics for resources not tied to instances
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or compute nodes.</para></listitem>
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</varlistentry>
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<varlistentry><term>A notification agent (<systemitem class="service"
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>ceilometer-agent-notification</systemitem>)</term>
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<listitem><para>Runs on a central management server to initiate
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alarm actions, such as calling out to a webhook with a description
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of the alarm state transition.</para></listitem>
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</varlistentry>
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<varlistentry><term>A collector (<systemitem class="service"
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>ceilometer-collector</systemitem>)</term>
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<listitem><para>Runs on central management server(s) to monitor the
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@ -55,26 +61,32 @@
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metering messages, which are sent to the message bus using the
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appropriate topic. Telemetry messages are written to the data store
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without modification.</para>
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</listitem>
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</listitem>
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</varlistentry>
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<varlistentry><term>An alarm evaluator (<systemitem class="service"
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>ceilometer-alarm-evaluator</systemitem>)</term>
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<listitem><para>Runs on one or more central management servers to
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determine when alarms fire due to the associated statistic
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trend crossing a threshold over a sliding time window.</para></listitem>
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</varlistentry>
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<varlistentry><term>An alarm notifier (<systemitem class="service"
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>ceilometer-alarm-notifier</systemitem>)</term>
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<listitem><para>Runs on one or more central management servers to
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allow alarms to be set based on the threshold evaluation for a
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collection of samples.</para></listitem>
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</varlistentry>
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</varlistentry>
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<varlistentry>
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<term>A data store</term>
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<listitem><para>A database capable of handling
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concurrent writes (from one or more collector instances)
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and reads (from the API server).</para></listitem>
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</varlistentry>
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<varlistentry>
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<varlistentry>
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<term>An API server (<systemitem
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class="service">ceilometer-api</systemitem>)</term>
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<listitem><para>Runs on one or more central management servers to
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provide data access from the data store.</para></listitem>
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</varlistentry>
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</varlistentry>
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</variablelist>
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<para>These services communicate by using the OpenStack messaging bus.
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Only the collector and API server have access
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