In an MD-RAID1 system the rebuild process does not begin automatically without re-add the disk to MD-RAID1

Issue

• When a RAID leg is removed, the resync of MD-RAID1 does not begin automatically when the exiting disk re-add or new disk inserted.
• Need to re-add the disk once removed from the MD-RAID1 setup using #mdadm --manage command.

# mdadm -D /dev/md1
/dev/md1:
           Version : 1.2
     Creation Time : Thu Jul 27 10:11:02 2023
        Raid Level : raid1
        Array Size : 103808 (101.38 MiB 106.30 MB)
     Used Dev Size : 103808 (101.38 MiB 106.30 MB)
      Raid Devices : 2
     Total Devices : 1
       Persistence : Superblock is persistent

       Update Time : Tue Aug 29 10:11:47 2023
             State : clean, degraded 
    Active Devices : 1
   Working Devices : 1
    Failed Devices : 0
     Spare Devices : 0

Consistency Policy : resync

              Name : rhel8-3:1  (local to host rhel8-3)
              UUID : bd47b8a3:22dc9a21:dbfb4b28:91f3c70a
            Events : 38

    Number   Major   Minor   RaidDevice State
       2       8      112        0      active sync   /dev/sdh
       -       0        0        1      removed