Ceph: Cluster in HEALTH_WARN with 1 MDSs report slow requests and 1 MDSs behind on trimming.

Issue

Cluster in HEALTH_WARN with 1 MDSs report slow requests and 1 MDSs behind on trimming.

Example:

[pao@edon1 ~]$ ceph -s
  cluster:
    id:     8d23xxxx-Redacted-Cluster-ID-yyyya00794f2
    health: HEALTH_WARN
            1 MDSs report slow requests
            1 MDSs behind on trimming

  services:
    mon: 3 daemons, quorum edon3,edon2,edon1 (age 6d)
    mgr: edon1(active, since 6d), standbys: edon1, edon1
    mds: 2/2 daemons up, 1 standby
    osd: 324 osds: 324 up (since 6d), 324 in (since 6d)

  data:
    volumes: 1/1 healthy
    pools:   13 pools, 10625 pgs
    objects: 101.79M objects, 51 TiB
    usage:   158 TiB used, 458 TiB / 616 TiB avail
    pgs:     10625 active+clean

[pao@edon1 ~]$ ceph health detail
HEALTH_WARN 1 MDSs report slow requests; 1 MDSs behind on trimming
[WRN] MDS_SLOW_REQUEST: 1 MDSs report slow requests
    mds.cephfs.edon1.xxxyyy(mds.0): 569 slow requests are blocked > 30 secs
[WRN] MDS_TRIM: 1 MDSs behind on trimming
    mds.cephfs.edon1.xxxyyy(mds.0): Behind on trimming (431866/128) max_segments: 128, num_segments: 431866

Further, this KCS is specific to MDS Slow Requestsaka Blocked Ops which are many hours old and the MDS has not been restarted.
In general, restarting the MDS when it's behind on trimming is an extremely bad idea.