In some cases when there are a lot of clients and these clients have a lots of known requests need to replay too, the metrics requests will be dropped by the MDS because the MDS is still in the clientreplay state, and also the useless metric requests will slow down MDS.
Please specify the severity of this bug. Severity is defined here: https://bugzilla.redhat.com/page.cgi?id=fields.html#bug_severity.