dibbler was adopted by the Salvage Team for a final life-support
release in trixie, with consensus to remove it from forky:

dibbler (1.0.1-2) unstable; urgency=medium

  * QA upload.
  * Adopt to the Salvage Team for removal in forky (Closes: #894556)
  * d/NEWS: add upstream orphaning and downstream removal-in-forky notice
  * d/dibbler-{client,relay,server}.service: add (Closes: #1039172)

dibbler (1.0.1-2) unstable; urgency=medium

  Around 2021-06-21, upstream has been officially orphaned:
  > Dibbler project is now concluded.
  >   I've been maintaining it for 15 years or so, but it's time to move on.
  >   Some time around 2017, I stopped maintaining or developing the project
  > further. Feel free to use it, but there isn't anyone to fix any bugs
  > or actively working on new features.
  >   If you're using dibbler-server, please seriously consider migrating
  > to ISC Kea, which is far better solution.
  >   If you're using dibbler-client,
  > consider migrating to one of many better maintained alternatives.

  Read full statement at
http://web.archive.org/web/20230119185521/http://klub.com.pl/dhcpv6/

  As such, this package will be removed after trixie.
  Migrate before forky.