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?

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

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