Unfortunately, the Bugzilla API may return a 200 response when a request is blocked by Fastly, which can lead to silent errors. Examples where silent error could happen: https://github.com/mozilla/bugbug/blob/f2323b67b1239b92cfda524eea321724d13138b4/bugbug/tools/core/platforms/bugzilla.py#L86 https://github.com/mozilla/bugbug/blob/f2323b67b1239b92cfda524eea321724d13138b4/bugbug/tools/core/platforms/bugzilla.py#L95