open-consul/.changelog/16000.txt
Derek Menteer 9b0984e5a6
Fix configuration merging for implicit tproxy upstreams. (#16000)
Fix configuration merging for implicit tproxy upstreams.

Change the merging logic so that the wildcard upstream has correct proxy-defaults
and service-defaults values combined into it. It did not previously merge all fields,
and the wildcard upstream did not exist unless service-defaults existed (it ignored
proxy-defaults, essentially).

Change the way we fetch upstream configuration in the xDS layer so that it falls back
to the wildcard when no matching upstream is found. This is what allows implicit peer
upstreams to have the correct "merged" config.

Change proxycfg to always watch local mesh gateway endpoints whenever a peer upstream
is found. This simplifies the logic so that we do not have to inspect the "merged"
configuration on peer upstreams to extract the mesh gateway mode.
2023-01-18 13:43:53 -06:00

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```release-note:breaking-change
connect: Fix configuration merging for transparent proxy upstreams. Proxy-defaults and service-defaults config entries were not correctly merged for implicit upstreams in transparent proxy mode and would result in some configuration not being applied. To avoid issues when upgrading, ensure that any proxy-defaults or service-defaults have correct configuration for upstreams, since all fields will now be properly used to configure proxies.
```