nut-monitor is missing

Thanks for reporting.

I've taken the liberty of reassigning this bug to the nut package.

When skimming the changelog it looks like nut-monitor was removed due to dependencies on unmaintained libraries. See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=885358 and https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=937169 for more details.

The changelog entry in question:
nut (2.7.4-11) unstable; urgency=medium

  * Remove python(2) binding and disable nut-monitor package for now as it
    depends on unmaintained pygtk (Closes: #885358, #937169)
  * debian/control: Add support for the <!nodoc> Build-Profile
  * debian/patches/0013-fix-doc-build.patch: Fix the documentation build with
    asciidoc >= 0.9
  * Disable python3-nut package for now as it's broken with python3

 -- Laurent Bigonville <email address hidden> Sun, 15 Dec 2019 21:22:13 +0100

Would it be useful to have a qt port of nut-monitor?

Yeah we'd have someone work on upstream to support a backend that still exists and is maintained to be able to enable it (again).
If you are up to that keep this bug updated when it was accepted upstream so that we can help enabling&packaging the feature then.