Custom builders are rarely used. The work on upgrading our buildbots to 0.9 is in progress but moves slowly (sadly, Zach failed to finish this task at the CPython sprint last week). I close the issue, even if it's not done, just because I didn't get any such email last month.

If email notifications related to custom builders start to annoy me again, I will open an issue in the CPython buildbot configuration project or the CPython workflow project.