Spector

Aggregate your log data across many different sources into MongoDB and view your logs on one central Drupal installation.

The functionality includes:
-) Viewing your log data
-) a Notification system to alert users about certain log messages by mail, sms, IM, ...
-) interesting visual statistics about your logs
-) Running map-reduce Jobs on your log data and retrieving the output via a convenient interface
-) aggregation of usage statistics with possible near real-time information ( depending on how you choose to aggregate your data)