[TRACE] Entering function main()
[DEBUG] Variable x = 42
[VERBOSE] Processing batch item 1 of 100
[INFO] User logged in successfully
[NOTICE] Scheduled maintenance in 1 hour
[WARN] Deprecated API endpoint used: /api/v1/users
[WARNING] Cache size approaching limit
[CAUTION] Disk space low: 10% remaining
[ERROR] Failed to process payment
[ERR] Invalid request format
[CRITICAL] System temperature too high
[CRIT] Memory exhaustion detected
[FATAL] Application crash - core dumped
[PANIC] Unrecoverable state reached
[EMERG] System shutdown imminent
[ALERT] Security breach detected
