Questions on client knob PROXY_COMMIT_OVERHEAD_BYTES

how to understand the comment around this knob //The size of serializing 7 tags (3 primary, 3 remote, 1 log router) + 2 for the tag length? I can’t find where all these tags are in the source code, and what’s the meaning of all these tags?

It means this Tag struct. For what tags mean in FDB, I’d suggest referencing the FoundationDB paper.

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