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I signed it!

Please note that this PR can't be merged yet. It is blocked on envoyproxy/envoy#2719 getting merged first. However, I'd like to get early feedback on this if possible.

/ok-to-test

envoyproxy/envoy#2719 was merged upstream into Envoy. Updated this PR to pick the upstream commit.

Please sign the CLA. LGTM otherwise.

@lizan I already signed the CLA. Thanks!