Windows Event Management doubt(s)

Sorry, was headed into a meeting and didn't have time to explain.  Pre-reading: https://www.logicmonitor.com/support/logicmodules/eventsources/types-of-events/windows-event-log-monitoring Pay particular attention to the FILTEREDEVENTS option.

You can combine multiple sets of criteria into a single EventSource. You do this in your filters. As you found, you can set very specific filters so that each EventSource is responsible for alerting on a particular event. Instead, be less specific and one EventSource can capture multiple events. You can use RegEx to create a filter as complex as needed.  When the alert is opened the "Alert Message" template is used to create the alert message displayed in the alert. Since it uses tokens, you can use a single template for most (or all) of the events.