feat(envoy): use the healthcheck filter and a prestop hook to gracefully terminate Envoy #6194
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What this PR does / why we need it:
Some clients will receive resets when
seldon-envoy
is restarting. These can be reduced by slowing down the termination sequence and triggering readiness checks to fail, so the kubelet will remove the pod's endpoint from Service load balancing.Which issue(s) this PR fixes:
Fixes # INFRA-1254
Special notes for your reviewer:
Perhaps this should be improved in future with something that at least logs some information about the
preStop
sequence.