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a79b1d23b8
So even if the server doesn't support sending patches (neither the Tailscale control server nor Headscale yet do), this makes the client convert a changed node to its diff so the diffs can be processed individually in a follow-up change. This lets us make progress on #1909 without adding a dependency on finishing the server-side part, and also means other control servers will get the same upcoming optimizations. And add some clientmetrics while here. Updates #1909 Change-Id: I9533bcb8bba5227e17389f0b10dff71f33ee54ec Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>