Defines the label to use for success messages.
Defines the label to use for success messages. Because the label for levels is defined in this module, the success label is also defined here.
Returns the level with the given name wrapped in Some, or None if no level exists for that name.
An enumeration defining the levels available for logging. A level includes all of the levels with id larger than its own id. For example, Warn (id=3) includes Error (id=4).