Howdy. I see a seemingly random 500 error response from bugs.gentoo.org. Usually, a refresh or a re-POST 'resolves' the issue. But it 'feels' like a load balancer backend pool has a member that is not healthy. I've seen this over the last month or so, and it happens often enough to be memorable. I'm not sure what kind of background information I can give you-all, other than to start a monitor that tests for the HTTP status given a logged-in user doing representative tasks of users' personas (which would probably annoy the infra maintainers more than help). However, I'm happy to help! Cheers.
* "I've seen seemingly random 500 error responses from bugs.gentoo.org over the last month or so."