Why gstatus command returns UNHEALTHY?

Issue

• Why gstatus command returns UNHEALTHY even RHGS is healthy?

# gstatus -a

Updating volume information

     Status: UNHEALTHY                     15.00 GiB(raw used)
   Glusterfs: 3.12.2                        14.00 GiB(usable from volumes)
  OverCommit: No                Snapshots:   0

   Nodes       :  3/  3       Volumes:   1 Up
   Self Heal   :  0/  3                  0 Up(Degraded)
   Bricks      :  3/  3                  0 Up(Partial)
   Connections :  3/   9                     0 Down

Volume Information


    glfs1            UP - 3/3 bricks up - Replicate
                     Capacity: (36% used) 5.00 GiB/14.00 GiB (used/total)
                     Snapshots: 0
                     Self Heal:  0/ 3
                     Tasks Active: None
                     Protocols: glusterfs:on  NFS:off  SMB:on
                     Gluster Connectivty: 3 hosts, 9 tcp connections


Status Messages
  - Cluster is HEALTHY, all_bricks checks successful