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How can I create a rolling average for a given metric?

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Simon Forey
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You can use the compute engine and history periods to create a rolling average for any given metric.

Details of how to do this are shown below 

1) the first thing you need to do is add a cell or headline that will retain the average value.  To do this you need to use the 'Dataviews' section under the Advanced section of the sampler. 

We are using a Sampler called CPU which uses CPU plugin:
<sampler name="CPU">
    <var-group>
        <data>Hardware</data>
    </var-group>
    <plugin>
        <cpu></cpu>
    </plugin>
    <dataviews>
        <dataview name="CPU">
            <additions>
                <var-headlines>
                    <data>
                        <headline>
                            <data>Hourly Average</data>
                        </headline>
                    </data>
                </var-headlines>
            </additions>
        </dataview>
    </dataviews>
</sampler>

2) You then need to add a history period over which you want to collect an average.  This is added to the rules section of the setup, here is an example:

 
<historyPeriod name="1 hour">
    <calculationPeriod>
        <rollingPeriod>
            <measure>hour</measure>
            <length>1</length>
        </rollingPeriod>
    </calculationPeriod>
</historyPeriod>

3) within a rule you can now add a value to the cell you created in the first step using rule syntax like below

 
<rule name="Example History period">
    <targets>
        <target>/geneos/gateway[(@name=&quot;TRAINING_LAB_544823731&quot;)]/directory/probe[(@name=&quot;np_lab1&quot;)]/managedEntity[(@name=&quot;TRAINING1&quot;)]/sampler[(@name=&quot;CPU&quot;)][(@type=&quot;Infrastructure Defaults&quot;)]/dataview[(@name=&quot;CPU&quot;)]/headlines/cell[(@name=&quot;Hourly Average&quot;)]</target>
    </targets>
    <priority>1</priority>
    <pathAliases>
        <pathAlias name="sourceCell">/geneos/gateway[(@name=&quot;TRAINING_LAB_544823731&quot;)]/directory/probe[(@name=&quot;np_lab1&quot;)]/managedEntity[(@name=&quot;TRAINING1&quot;)]/sampler[(@name=&quot;CPU&quot;)][(@type=&quot;Infrastructure Defaults&quot;)]/dataview[(@name=&quot;CPU&quot;)]/rows/row[(@name=&quot;Average_cpu&quot;)]/cell[(@column=&quot;percentUtilisation&quot;)]</pathAlias>
    </pathAliases>
    <block>
        <transaction>
            <update>
                <property>@value</property>
                <average>
                    <historicalDataItem>
                        <pathAlias ref="sourceCell"></pathAlias>
                        <property>@value</property>
                        <historyPeriod ref="1 hour"></historyPeriod>
                    </historicalDataItem>
                </average>
            </update>
        </transaction>
    </block>
</rule>

 

 

 


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