I think I understand the issue, but don't see a documented explanation
of why this needs to be added to stable Ubuntu releases.

What is the actual impact to users in not having mdadm able to pass
through this "broken" state information, please, and how would adding
this feature to stable releases resolve this impact?

My two concerns are:

1) It looks like a medium complexity patch to mdadm and that risks
introducing a regression. A regression in mdadm could be very severe,
such as one that results in data loss.

2) As you mention, userspace tooling might break in unexpected ways. Is
mdadm intended to behave *exactly* the same after this patch is applied
for users with no arrays in the new "broken" state (excluding help/usage
messages etc)? In other words, is any tooling breakage limited to when
an array breaks?

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https://bugs.launchpad.net/bugs/1847924

Title:
  Introduce broken state parsing to mdadm

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