access log: add a new response flag to indicate request handled locally by Envoy
#13.100 aperta il 15 set 2020
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Title: access log: add a new response flag to indicate request handled locally by Envoy
Description: This is started from the discussion in https://github.com/envoyproxy/envoy/pull/12912#discussion_r490613876 that we could have a more general way to indicate that the request is handled locally by Envoy (sendLocalReply) instead of by upstream.
The response flag could be RESPONDED_BY_FILTER and deprecates the other response_from_cache_filter. The RESPONSE_CODE_DETAIL can be used to learn more details.
cc @htuch
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