504 errors from cgit-beta

[Davíð Steinn Geirsson]

Hi,

We are getting frequent 504 errors when running `git fetch` against an
existing checkout of `ports.git` from https://cgit-beta.freebsd.org/ports.git:

```
$ git fetch cgit-beta
error: RPC failed; HTTP 504 curl 22 The requested URL returned error: 504
fatal: the remote end hung up unexpectedly
```

We have a scheduled CI pipeline that runs every 4 hours and pulls in new
changes from https://cgit-beta.freebsd.org/ports.git and it seems to
fail about half of the time. Just looking at the last 24 hours:
Thu, 12 Nov 2020 12:29:26 +0000 - failed
Thu, 12 Nov 2020 08:28:49 +0000 - success
Thu, 12 Nov 2020 04:28:44 +0000 - failed
Thu, 12 Nov 2020 00:28:25 +0000 - success
Wed, 11 Nov 2020 20:27:53 +0000 - failed
Wed, 11 Nov 2020 16:29:27 +0000 - success
Wed, 11 Nov 2020 12:29:09 +0000 - failed

I saw the recent discussion on the change in GC settings
(https://lists.freebsd.org/pipermail/freebsd-git/2020-October/000466.html)
and tried to reset our checkout (deleted the ports project in our gitlab,
created a new clone from cgit-beta and pushed into a new, clean project),
but it did not have any effect.

Any ideas what could be causing this?

PS: Has any date been decided on when the switchover will happen and git
becomes the canonical source of truth? I am excited to not have to touch
subversion again :)

Thanks,
-Davíð
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