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NodeMutationAdd was a misleading name: a PeersChanged entry in a MapResponse can represent either a truly new peer or a full replacement for an existing peer that couldn't be expressed as a PeerChangedPatch. Calling it "Add" implied it was always a completely new node, which is wrong. (I'd changed my mind on the design of mapping add/delete events to NodeMutations halfway through #19607 and forgot to update the name, even though I'd updated half the docs) Rename it to NodeMutationUpsert to reflect the actual semantics: the node should be inserted or replaced in the peer map regardless of whether it already existed. Updates #19607 Updates #12542 Change-Id: Iebd3daddb3318cba02e115a1b184fcb3ee8f83d6 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>