The Alert level designates very severe error events. Take immediate action, alerts.

The All level designates the lowest level possible.

The Critical level designates very severe error events. Critical condition, critical.

The Debug level designates fine-grained informational events that are most useful to debug an application.

The Emergency level designates very severe error events. System unusable, emergencies.

The Error level designates error events that might still allow the application to continue running.

The Fatal level designates very severe error events that will presumably lead the application to abort.

The Fine level designates fine-grained informational events that are most useful to debug an application.

The Finer level designates fine-grained informational events that are most useful to debug an application.

The Finest level designates fine-grained informational events that are most useful to debug an application.

The Info level designates informational messages that highlight the progress of the application at coarse-grained level.

The Emergency level designates very severe error events. System unusable, emergencies.

The Notice level designates informational messages that highlight the progress of the application at the highest level.

The Off level designates a higher level than all the rest.

The Severe level designates very severe error events.

The Trace level designates fine-grained informational events that are most useful to debug an application.

The Verbose level designates fine-grained informational events that are most useful to debug an application.

The Warn level designates potentially harmful situations.