Gzip and remove logs generated by Go's glog: https://github.com/golang/glog
It will figure out the date of the log entries from the filename. It won't touch files where the 'WARNING' and 'INFO' &c symlinks point to.
glogrotate -base=/var/log/ -maxage=$((30 * 24))h myapp myotherapp
It'll gzip all non-current files in
and delete INFO files older than 30 days, WARNING files older than 2 * 30 days, and ERROR files older than 3 * 30 days. See -help how to change the periods.