Indeed, this was removed in 2023 in version 0.9.4-4 and later

      [ Chris Hofstaedtler ]
      * [8c46661] Remove library development files and all of libdmmp.
        There are no users of the multipath libraries outside of multipath(d)
        itself.  Recently qemu gained support for multipath reservations; when 
qemu
        wants to use this, the multipath-tools maintainers need to understand 
the
        ABI status.
        Disable building libdmmp completely, as no users seem to exist at all.

Which as an argument makes sense.
There are soname 0 which are heavily used and there are others which you should 
never touch.
I'm unsure if there have been discussions between multipath-tools and qemu 
folks about this, but raising such seems to be the right away.
Better than:
a) not enabling it ever fearing but not knowing if it might be bad
b) just bringing back the lib and enabling it but not knowing if it might be bad

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https://bugs.launchpad.net/bugs/2117378

Title:
  qemu-pr-helper doesn't have multipath support

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