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87a2289e7e
updates tailscale/tailscale#1909 This adds a new new NotifyWatchOpt that allows you to receive PeerChange events (derived from node mutations) on the IPN bus in lieu of a complete netmap. We'll continue to send the full netmap for any map response that includes it, but for mutations, sending PeerChange events gives the client the option to manage it's own models more selectively and cuts way down on json serialization overhead. On chatty tailnets, this can vastly reduce the amount of chatter on the bus. This change should be backwards compatible, it is purely additive. Clients that subscribe to NotifyNetmap will get the full netmap for every delta. New clients can omit that andinstead opt into NotifyPeerChanges. Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>