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The queue_log file located in /var/log/asterisk/ contains information about the queues defined in your system (when a queue is reloaded, when queue members are added or removed, etc.) and about calls into the queues (e.g., their status and what channels the callers were connected to). The queue log is enabled by default, but can be controlled via the logger.conf file. There are three options related to the queue_log file specifically:
queue_log
Controls whether the queue log is enabled or not. Valid values are yes or no (defaults to yes).
queue_log_to_file
Controls whether the queue log should be written to a file even when a real time backend is present. Valid values are yes or no (defaults to no).
queue_log_name
Controls the name of the queue log. The default is queue_log.