Support new access log operators from Envoy 1.23.0 #4627
Merged
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See https://www.envoyproxy.io/docs/envoy/v1.23.0/version_history/v1.23/v1.23.0#new-features
Adds support for %METADATA% complex operator (not %UPSTREAM_METADATA% since
that is deprecated apparently) and simple operators:
%UPSTREAM_PROTOCOL%, %UPSTREAM_PEER_SUBJECT%, %UPSTREAM_PEER_ISSUER%,
%UPSTREAM_TLS_SESSION_ID%, %UPSTREAM_TLS_CIPHER%,
%UPSTREAM_TLS_VERSION%, %UPSTREAM_PEER_CERT_V_START%,
%UPSTREAM_PEER_CERT_V_END%, %UPSTREAM_PEER_CERT% and
%UPSTREAM_FILTER_STATE%
Fixes #4624