By default the request.log and nexus.log files are archived every 24 hours.
The file name formats are defined in logback.xml and logback-access.xml respectively.
Example from nexus-3.1.0-02:
There is a needless inconsistency. This also appears to be a regression - this was once fixed in : https://github.com/sonatype/nexus-oss/pull/1550/files
Change the name format of the nexus log to match the request log:
What happened to archiving the karaf.log? Any other log archives should be named similar to above pattern.