We are in the process of testing some changes to our load balancers in order to fix some known networking issues with them. This may manifest as intermittent 502 Bad Gateway errors affecting a portion of API traffic. We are monitoring these tests closely and will correct any issues as swiftly as possible.
Update 2018-04-24T19:40Z: Most of our tests are progressing transparently; however, we are aware that 502 Bad Gateway errors have manifested for some users starting at 18:00Z. We expect these to be completely resolved by 20:00Z.
Update 2018-04-24T20:11Z: Another round of erroring tests means that a small percentage of requests will continue to experience 502 Bad Gateway errors through 21:00Z. Sorry, but thanks for bearing with us!
Update 2018-04-25T13:00Z: All of our tests are complete.