[Bug 2019293] Update Released

[Brian Murray]

The verification of the Stable Release Update for ceph has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/2019293

Title:
  mgr: relax "pending_service_map.epoch > service_map.epoch" assert

Status in ceph package in Ubuntu:
  Invalid
Status in ceph source package in Focal:
  Fix Released

Bug description:
  [Impact]

  This issue has been observed from ubuntu Octopus release. 
  An assert will be triggered during the mgr fail-over process if the new active one unexpectedly received two continuous service map update. 
  The upstream fix has relaxed the assert condition to allow the new active mgr to receive multiple service map update in a fail-over scenario. 

  [Test Case]

  1. Deploy a 15.2.16 ceph cluster

  2. upgrade it to 15.2.17, inject multiple service map to the monitor

  3. stop the active mgr

  4. observe the new active mgr will hit the assert condition

  
  [Potential Regression]
  The new active mgr would be required to process multiple service map, it might slow down a little bit on the fail-over process, but still much better than crash.


  [Other info]

  Upstream bug tracker: https://tracker.ceph.com/issues/51835
  Upstream PR: https://github.com/ceph/ceph/pull/45984
  we need to backport it to octopus

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