Event driven systems monitoring

If you are running an event-driven system, end-to-end monitoring is a nightmare.

Most of the time you end up writing your own custom monitoring scripts.

I've spoken with co-workers and friends who have all said the same thing, but want a white-label service to do it for them.

The premise is

• The monitoring script sends a message onto the queue
• The message get's processed through the queue
• When the message completes, it notifies the monitoring script to verify it was done

This system doesn't exist. But, I believe it might not because it might be a struggle to make it generic enough to work in different cases, but also useful.

Has anyone else had this problem? Is there a product here?