You can easily identify any legend rule. The legend rules are contained in XML files sorted by AppManager module name in C:\Program Files\NetIQ\Analysis Center\Config\Legend on the Data Warehouse computer.
For example, in CIM.LEGEND.XML, you can see the mapping of the ASR Reboot Count data stream legend of the CIM_ASRHealth Knowledge Script.
<RULE ID="CIM_ASRHealth.1">
<EXPRESSION>^ASR Reboot Count$</EXPRESSION>
<ITEM IDX="0" LABEL="Number of Reboots" MATCH="TRUE" />
<UNITS>#</UNITS>
<KSName>CIM_ASRHealth</KSName>
<ACApplication>CIM</ACApplication>
<ACObject NAME="" />
<ACMetricCategory NAME="" />
<SampleHiddenLegend>ASR Reboot Count</SampleHiddenLegend>
<StaticDataDescription>Automatic Server Recovery (ASR) Health</StaticDataDescription>
<DynamicDataFormat>Number of Reboots</DynamicDataFormat>
<Type NAME="CIMT_ASR" />
</RULE>
Knowledge Scripts that collect more than one data stream will have more than one rule. The additional rules for the data stream will have a unique number assigned to the rule. So in the above example, if there were a second data stream rule for the CIM_ASRHealth Knowledge Script, the “ID” for the rule would be CIM_ASRHealth.2.