When you are running a micro-integrator on a microservices environment, administrators who have admin access to the micro-integrator are able to change its configurations via admin services API. When someone needs to debug the system and find out which person did what change, then the micro-integrator needs to keep a log of activities performed on the micro-integrator. Audit logs are simply a set of logs that let you find what are the changes performed on the micro-integrator instance.
Audit logs feature support from the APIM 4.1.0 onward. The audit logs feature is enabled by default you can find the logs getting printed in the repository/logs/audit.log file when you have done any changes to the micro-integrator through the admin service API.