Separating Administrative Events and Operational, Analytical, or Trace/Debug Messages

If there's one thing an IT pro really hates, it's an application that makes a lot of noise in the application event log, drowning out the really important messages that well-behaved applications produce from time to time. You shouldn't be writing operational, analytical, or trace/debug messages to the application log! These are more appropriate for a custom application log.

From Security Briefs: Improve Manageability through Event Logging by Keith Brown.