Requests hang during reverse proxy upgrade

Following an usual update on one of our public reverse proxies, some requests were hanging instead of being processed.

During the upgrade process, one of the workers of this reverse proxy continued to accept connections but didn't process them and kept them until the requests timeout. The issue has been resolved by 11:10 UTC+1 and will be investigated further. This is the first time the upgrade process fails us in months and we will take extra-steps to avoid and detect this issue faster.