As a system admin, I would like to monitor the mirrors for any repositories that have not synced on the mirrors in a reasonable amount of time after the changes are done in the repository on the primary server. Currently the only way I can check if a repository is out of sync or not is by visiting the repository browsing page and looking at the "Last synced" time against the mirror on the clone dialog. While this option can be used to find out the state for any given repository at a given time, but it is not possible to know which repositories are lagging behind on mirrors as compared to their primary counterparts at any given point of time.

See https://developer.atlassian.com/server/bitbucket/rest/v902/api-group-mirroring--mirror-/#api-mirroring-latest-supportinfo-out-of-sync-repos-content-get