Aggregate versus maximum severity KPI values in ITSI
Use the KPI Value dropdown at the top of the Service Analyzer to change the way KPI values are presented in the Service Analyzer.
Aggregate is the default view in Service Analyzer. It shows the most recent value of the KPI as defined in the KPI calculation settings in the service definition. An example of the calculation settings for a KPI called "Storage Free Space: %" is shown below.
In this example, the Service/Aggregate Calculation is set to report on the average percentage of free space across all contributing entities. This average is the value that is displayed when "KPI Value: Aggregate" is selected in Service Analyzer.
The Max Severity view shows the worst performing value for the KPI. This value is either the value of the worst performing entity for the KPI, or -- if the aggregated value of all contributing entities is worse than the value of any single contributing entity -- the aggregated value of all contributing entities. Using Max Severity KPI values can help you identify which KPI is affecting the service health score of a service the most.
For the example above, if "KPI Value: Max Severity" is selected in Service Analyzer, the KPI for Storage Free Space: % will show the value of the worst performing entity if any of the entity values is worse than the Service/Aggregate value.
If a KPI is not split by entity, the Aggregate and Max Severity values for the KPI are the same.
Example of the difference between using aggregate KPI value vs. max severity
For example, let's say you have a Database service that contains the KPI "Storage Free Space: %". This KPI is split by entity and there are three entities (hosts): mysql-01, mysql-02, and mysql-03.
In this scenario, the mysql-02 host is running critically low on disk space. The Database service is showing a high severity level (orange) on the Service Analyzer. You want to know which KPIs are responsible for the low health score.
Using the Aggregate KPI view, the Storage Free Space: % KPI could be green even though the mysql-02 host is critically low on disk space. This is because when the value of mysql-02 is aggregated with the value of the other two hosts (entities), the value is still within the normal threshold that was set in the aggregate thresholds for the KPI.
If you switch to the Max Severity KPI view, the KPI shows the value of the worst performing entity rather than an aggregated value. Therefore, the KPI switches from green to red (critical) and the value of the KPI changes to reflect the alert value for mysql-02.
Now that you've identified the KPI that is most likely responsible for the degraded health score of the Database service, you can click the KPI tile to see which entity for the Storage Free Space: % KPI is lowest on disk space (mysql-02 in this example).
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ITSI Service Analyzer use case
This documentation applies to the following versions of Splunk® IT Service Intelligence: 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.1.0, 4.1.1, 4.1.2, 4.1.5, 4.2.0, 4.2.1, 4.2.2, 4.2.3, 4.3.0, 4.3.1