This package has no reverse dependencies, and was last updated in 2021,
does it make sense to keep in testing?  Or even in Debian?

It is affected by the go.mod issue:
https://wiki.debian.org/DebConf/26/Sprints/DebianGoTeam/DevPackages

Opening this to have some discussion, maybe we don't need to QA this
package.

/Simon

Dear submitter,

as the package golang-github-centrifugal-centrifuge has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1150688

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)