feat(logging): Allow overriding message key for structured logging #16242
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Summary
This PR adds a config option which controls the message key used for structured logs, which currently defaults to the
slog.MessageKeyvalue of "msg".This is particularly useful for changing the key from
msgtomessage, to allow automatic log parsing into certain log processing pipelines (without having to use another tool like fluentbit).Checklist
Related issues
resolves #16241