Version 5.12.0-9 of collectd is marked for autoremoval from testing on Sat 20 Aug 2022. It is affected by #1016187. It depends (transitively) on dlt-daemon, nut, affected by #1013003, #1014534. You should try to prevent the removal by fixing these RC bugs.
Problems while searching for a new upstream version
high
uscan had problems while searching for a new upstream version:
In debian/watch no matching files for watch line
https://github.com/collectd/collectd/tags /collectd/collectd/archive/collectd-([0-9.-]+)\.tar\.gz