Drupal's Syslog module is one of the core modules that I find is often overlooked. On a high traffic site, it's generally a good idea to reduce the db traffic as much as possible. Besides, since the database logging doesn't rotate/archive logs, it is only marginally helpful. So, while you need watchdog, it can quickly bite you in the... sorry, bad pun, but you get the idea. The good news is that we can still log all of these helpful messages in a flat file using Syslog and do some insanely cool reporting using Splunk.

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