| Level | Description |
|---|---|
TRACE |
Logging from external libraries used by your app or very detailed application logging. |
DEBUG |
Anything else, i.e. too verbose to be included in "info" level. Report calls of important functions along with results they return and values of specific variables, or parameters. |
INFO |
Detail on regular operation. Informative messages should not be reported too frequently because they can quickly become noise. |
WARN |
A note on something that should probably be looked at by an operator eventually. |
ERROR |
Fatal for a particular request, but the service/app continues servicing other requests. An operator should look at this soon. |
FATAL |
The service/app is going to stop or become unusable now. An operator should definitely look into this soon. |