Thank you so much Chris for chiming in, that provided the background
info that I assumed would be out there.

To be fair there are plenty of soname 0 out there, without much guarantees and 
the symbols files
handle most churn. But indeed allowing it would imply a transition every time 
you bump a version, which would be small with one known dependency being qemu 
then.
Maintaining DPDK I know exactly what you mean with "namespaced into a versioned 
namespace, which changes on every release" but that was never as painful as it 
sounds.

With that in mind it really seems to be about asking multipath-tools
again if they want to consider/treat this as more stable into the future
- or if they'd guide us in another way. They might say while unstable,
it is working fine because ... <reason>. Do you have a reference to
mail, chat or whatever was used back then to ask them in 2023?

P.S. The side experiment here is to trial and error creating a symbols file for 
these lib(s) which will help to detect whenever we change it. If we ever go to 
make them available again, that will be needed anyway. I'll add a 
multipath-tools task for tracking that. If working there are four of them 
overall:
$ dpkg -L multipath-tools | grep .so.0
/usr/lib/libmpathcmd.so.0
/usr/lib/libmpathpersist.so.0
/usr/lib/libmpathutil.so.0
/usr/lib/libmultipath.so.0

** Also affects: multipath-tools (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: multipath-tools (Ubuntu)
       Status: New => Confirmed

** Changed in: multipath-tools (Ubuntu)
   Importance: Undecided => Wishlist

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

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

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