Does onboarding custom event sources like Oracle database, ERPs(SAP), and Identity providers like PAM and IGA(Open text ) solution add value to the detection engine's ?
You can build your own detections against the data, provided the logs are in JSON format. If they are not in JSON you can custom parse the relevant keys to turn the logs into json post ingestion.
There is not however any pre-built rules against these sources you mentioned if they were to be ingested as custom log sources. The data lives in its raw form in Raw Log and any dashboards/queries or alerts would all be custom ones you create. .
David