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9.2. Statistics Sub-Collection

Each host resource exposes a statistics sub-collection for host-specific statistics. Each statistic contains the following elements:
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Table 9.6. Elements for host statistics
Element Type Description
name string The unique identifier for the statistic entry.
description string A plain text description of the statistic.
unit string The unit or rate to measure the statistical values.
type One of GAUGE or COUNTER The type of statistic measures.
values type= One of INTEGER or DECIMAL The data type for the statistical values that follow.
value complex A data set that contains datum.
datum see values type An individual piece of data from a value.
host id= relationship A relationship to the containing host resource.
The following table lists the statistic types for hosts.
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Table 9.7. Host statistic types
Name
Description
memory.total
Total memory in bytes on the host.
memory.used
Memory in bytes used on the host.
memory.free
Memory in bytes free on the host.
memory.buffers
I/O buffers in bytes.
memory.cached
OS caches in bytes.
swap.total
Total swap memory in bytes on the host.
swap.free
Swap memory in bytes free on the host.
swap.used
Swap memory in bytes used on the host.
swap.cached
Swap memory in bytes also cached in host's memory.
ksm.cpu.current
Percentage of CPU usage for Kernel SamePage Merging.
cpu.current.user
Percentage of CPU usage for users.
cpu.current.system
Percentage of CPU usage for system.
cpu.current.idle
Percentage of idle CPU usage.
cpu.load.avg.5m
CPU load average per five minutes.

Example 9.10. An XML representation of the host's statistics sub-collection

<statistics>
    <statistic href="/api/hosts/eaf4af64-e51c-4e72-a2cf-bdb6076a9e56/statistics/7816602b-c05c-3db7-a4da-3769f7ad8896" id="7816602b-c05c-3db7-a4da-3769f7ad8896">
        <name>memory.total</name>
        <description>Total memory</description>
        <values type="INTEGER">
            <value>
                <datum>2103443456</datum>
            </value>
        </values>
        <type>GAUGE</type>
        <unit>BYTES</unit>
        <host href="/api/hosts/eaf4af64-e51c-4e72-a2cf-bdb6076a9e56" id="eaf4af64-e51c-4e72-a2cf-bdb6076a9e56"/>
    </statistic>
</statistics>
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Note

A host's statistics sub-collection is read-only.
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