feature_map differs across mon_status

["Joel Davidow" <jdavidow@xxxxxxx>]

Just curious why the feature_map portions differ in the return of mon_status across a cluster. Below is an example from each of five mons in a healthy 16.2.10 cephadm cluster:

root@mon.d:~# ceph tell mon.a mon_status | jq .feature_map
{
  "mon": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 1
    }
  ],
  "osd": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 42
    }
  ],
  "client": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 1
    }
  ],
  "mgr": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 1
    }
  ]
}
root@mon.d:~# ceph tell mon.b mon_status | jq .feature_map
{
  "mon": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 1
    }
  ],
  "osd": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 36
    }
  ],
  "client": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 2
    }
  ]
}
root@mon.d:~# ceph tell mon.c mon_status | jq .feature_map
{
  "mon": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 1
    }
  ],
  "osd": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 81
    }
  ],
  "client": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 4
    }
  ],
  "mgr": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 2
    }
  ]
}
root@mon.d:~# ceph tell mon.d mon_status | jq .feature_map
{
  "mon": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 1
    }
  ],
  "osd": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 112
    }
  ],
  "client": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 7
    }
  ]
}
root@mon.d:~# ceph tell mon.e mon_status | jq .feature_map
{
  "mon": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 1
    }
  ],
  "osd": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 88
    }
  ],
  "client": [
    {
      "features": "0x3f01cfb9fffdffff",
      "release": "luminous",
      "num": 4
    }
  ]
}
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