INFO: System startup complete
ERROR: Failed to load configuration
INFO: User login successful
ERROR: Database connection lost
INFO: Scheduled task executed
ERROR: Out of memory
INFO: User logged out
ERROR: Disk space critically low
INFO: Backup completed
ERROR: Failed to send email
INFO: Service restarted
ERROR: Unauthorized access attempt
INFO: Shutdown initiated
ERROR: Kernel panic
INFO: Restarting services
ERROR: Failed to allocate resource
INFO: System check passed
ERROR: Service unavailable
INFO: Update successful
ERROR: Unexpected shutdown