PSR-3 log level descriptions

A quick reference for what each log level should be used for.

Level Description
Emergency System is unusable
Alert Action must be taken immediately. Example: Entire website down, database unavailable, etc. This should trigger the SMS alerts and wake you up.
Critical Critical condition. Example: Application component unavailable, unexpected exception.
Error Runtime errors that do not require immediate action but should typically be logged and monitored.
Warning Exceptional occurrences that are not errors. Example: Use of deprecated APIs, poor use of an API, undesirable things that are not necessarily wrong.
Notice Normal but significant events
Info Interesting events. Example: User logs in, SQL logs
Debug Detailed debug information

 

Reference: https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md

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