iod in which there are no bytes sent or received on either
the upstream or downstream connection.
If not set, the default idle timeout is 1 hour. If set to 0s, the timeout will be disabled.
Idle timeout is not configured per each cluster individually when weighted destinations are used,
because idleTimeout is a property of a listener, not a cluster. In that case, idleTimeout
specified in a destination rule for the first weighted route is configured in the listener,
which means also for all weighted routes.<