A log event is a condition and can be signalled as such. In addition to the classic "simpleMessage", "simpleWarning", and "simpleError" conditions, loggr allows for levels "INFO", "WARN", "DEBUG", "ERROR", "CRITICAL".
log_event(level, message, ...)
character: the event level.
character: the event message
further elements to add to the condition.
A log event (condition)