ivity issues between your gateway and your sidecars or among your sidecars with 503 errors in the log. This happens when 1.7.5+ proxies send HTTP 1xx or 204 response codes with headers that 1.7.x proxies reject. To fix this, upgrade all your proxies (gateways and sidecars) to 1.7.5+ as soon as possible. (<a href=https://github.com/istio/istio/issues/29427>Issue 29427</a>, <a href=https://github.com/istio/istio/pull/28450>More information</a>)</p></div><nav class=pagenav><div class=left><a title="Istio 1.8 r