You have a lot of different log files and events from hundreds of different sources. Like firewalls, webservers, switches, routers, Office 365, Exchange and whatnot.
A very nice utility for gathering these data, indexing them for searching, create reports and automations is Splunk
Splunk can run on Windows or Linux, or as a Cloud service.
There is a trial version available for all these, as well as a free version with some limitations.
You can expect a phone call from the UK after registering and downloading this software, but it’s well worth the effort.
I find the documentation very well written and explained, and there are a lot of application add-ons from the communtity.