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9d8c0c665e
This new type of probe sends DERP packets sized similarly to CallMeMaybe packets at a rate of 10 packets per second. It records the round-trip times in a Prometheus histogram. It also keeps track of how many packets are dropped. Packets that fail to arrive within 5 seconds are considered dropped, as are packets that arrive out of order. Updates tailscale/corp#24522 Signed-off-by: Percy Wegmann <percy@tailscale.com>