cloud app security and SIEM agent

SurVir, you don't use it anymore more today (2 years later). You would integrate MDCA (previously known as MCAS) within MDE and use the https://docs.microsoft.com/en-US/microsoft-365/security/defender/streaming-api?view=o365-worldwide to get all raw-data via https://docs.microsoft.com/en-US/microsoft-365/security/defender/advanced-hunting-cloudappevents-table?view=o365-worldwide table (for MDCA raw data). Alerts are merged into https://docs.microsoft.com/en-US/microsoft-365/security/defender/advanced-hunting-alertinfo-table?view=o365-worldwide table (for MDCA alerts) (for alerts you alternatively may use https://docs.microsoft.com/en-US/graph/api/resources/alert?view=graph-rest-1.0) and Incidents would require https://docs.microsoft.com/en-US/microsoft-365/security/defender/api-list-incidents?view=o365-worldwide (for MDCA merged incidents). This gets you safe all the information and is scalable and has no point of failures when implementing correctly - forget the MCAS SIEM AGENT , this was before they went "XDR".