'monitor_added', self::MONITOR_STARTED => 'monitor_started', self::MONITOR_FINISHED => 'monitor_finished', self::MONITOR_DELETED => 'monitor_deleted', self::MONITOR_ERROR => 'monitor_error', }; } public function message(): string { return match ($this) { self::MONITOR_ADDED => 'A new monitor has been added.', self::MONITOR_STARTED => 'A monitor has started.', self::MONITOR_FINISHED => 'A monitor has finished.', self::MONITOR_DELETED => 'A monitor has been deleted', self::MONITOR_ERROR => 'A monitor has encountered an error.', }; } }