With S3 repositories, the CERN stratum 1 and stratum 0 only differ in URL. They point to the same storage. The .cvmfs_status.json file needs to reflect that fact, so that monitoring systems do not look at a seemingly stale stratum 1. I suggest to use the pass-through keyword for the last_snapshot field. This needs to be supported by the cernvm-monitor and the cvmfs-servermon package.