Types of Logs in Drupal

Here's a breakdown of the common log types in Drupal:

WATCHDOG\_EMERGENCY: System is unusable.
WATCHDOG\_ALERT: Action must be taken immediately.
WATCHDOG\_CRITICAL: Critical conditions.
WATCHDOG\_ERROR: Error conditions.
WATCHDOG\_WARNING: Warning conditions.
WATCHDOG\_NOTICE: Normal but significant conditions (default).
WATCHDOG\_INFO: Informational messages.
WATCHDOG\_DEBUG: Debug-level messages.