Have you seen https://docs.splunk.com/Documentation/Splunk/8.0.6/InheritedDeployment/Introduction ? Once you understand your environment and data you can begin to understand your use cases and alerts.
Most of what you seem to be looking for should be at Settings->Searches, reports, and alerts. This page will show what scheduled searches, reports, and alerts are running on your system. Examination of the search used by each should tell you what data sources they use.
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If this reply helps you, Karma would be appreciated.
