Development information, messages that are useful when trying to debug library behavior, but superfluous to normal operation.
A given operation has failed and cannot be automatically recovered. The error may threaten the continuity of operation.
Informational messages. Operationally significant to the library but not out of the ordinary.
No logging will be performed.
Something routine and expected has occurred. This level will provide logs for the vast majority of operations and function calls.
Anything that is not immediately an error, but could cause unexpected behavior in the future. For example, passing an invalid value to an option. Indicates that some action should be taken to prevent future errors.
Represents the different levels of logging that can be used.