Enable Graceful Shutdown in Jetty #1651
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(Re-)introduce support for graceful shutdown in the embedded Jetty server.
(1) We want to continue to accept incoming HTTP connections during a grace period, so that we can answer 503 to the loadbalancer healthcheck requests.
(2) Then stop accepting further connections but wait for existing connections to complete.
(3) Shutdown after a further grace period (probably following the existing 60s connection timeout).
It seems the
shutdown.pause.secproperty is no longer used for anything. It was introduced in #896 but then those changes were removed in #1142.