question about command in undeleted kahadb log file

Hello, I am using activemq 5.6. Recently the kahadb log has increased and the old logs do not get deleted. When I check one log file for example, I can see only this kind of message and nothing else. What does this mean and why is the log file not deleted then? 16664 CommandType: KAHA_REMOVE_MESS

adding to Slack

Hi, I am new to activemq mailing list. Could anyone please invite me to the ActiveMQ Slack channel? Thanks in advance. Lan