Version 0.7-1 of fast-histogram is marked for autoremoval from testing on Tue 07 Jan 2020. It is affected by #945413. The removal of fast-histogram will also cause the removal of (transitive) reverse dependencies: glueviz, mpl-scatter-density. You should try to prevent the removal by fixing these RC bugs.
Standards version of the package is outdated.
The package should be updated to follow the last version of Debian Policy
(Standards-Version 4.4.1 instead of
Last update: 2019-09-29
This package is part of the ongoing testing transition known as python3.8.
Please avoid uploads unrelated to this transition, they would
likely delay it and require supplementary work from the release
managers. On the other hand, if your package has problems
preventing it to migrate to testing, please fix them
as soon as possible.
You can probably find supplementary information in the
archives or in the corresponding