Add metadata fallback for client sidecar reporters #6028
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
What this PR does / why we need it: Companion to istio/istio#54383. Use MX fallback if there's no ssl context for the upstream connection (there won't be when we're doing CONNECT encap due to the extra internal listener in between). Note that this doesn't help with the source principal; we may be able to set some filter state in the connect_encap listener and have stats read it before we flush, but I'd need to try it out.