Ref T13137. See PHI609. An install would like to filter audit requests on a particular branch, e.g. "master".
This is difficult in the general case because we can not apply this constraint efficiently under every conceivable data shape, but we can do a reasonable job in most practical cases.
See T13137#238822 for more detailed discussion on the approach here.
This is a bit rough, but should do the job for now.