It's been 2 months since Omid's post. Any information about this?
Currently it seems that you do not actually offer zero-downtime deployments of proxies. When using override=true with the delay parameter, you might get lucky and have no 503 errors returned. But that all depends on how in-flight connections are handled.
I'm surprised that Apigee doesn't handle this much more gracefully, letting the older deployment finish up all in-flight transactions before terminating.
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