The Consolidator has received 100 events for alert {DA832E10-DBAB-4F08-B1AF-C019CC8D49F8}. Future events for this alert will not be associated with the alert.

How can I find which alert this is referring to? I do not know how to find an alert by the GUID. Does this mean that MOM has decided not to pay attention to the event that caused the alert any longer?

The MOM DCAM Management chapter of the Operations Guide calls this the "100 Event Rule".

From the microsoft.public.mom newsgroup
The event will continue to be logged and the 'RepeatCount' on the alert will continue to be updated as long as that event matches the Critiria for the EPR (Event Processing Rule) that generated the alert.

When you open the alert in the MOM console, there is an 'Events' tab that shows you all events related to the alert. This has a 100 event limit, and afterwards, only the first 100 events will show in this tab.