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When traffic steering is enabled, some users are suggested an exit node that is inappropriately far from their location. This seems to happen right when the client connects to the control plane and the client eventually fixes itself. But whenever an affected client reconnects, its suggested exit node flaps, and this happens often enough to be noticeable because connections drop whenever the exit node is switched. This should not happen, since the map response that contains the list of suggested exit nodes that the client picks from, also contains the scores for those nodes. Since our current logging and diagnostic tools don’t give us enough insight into what is happening, this PR adds additional logging when: - traffic steering scores are used to suggest an exit node - an exit node is suggested, no matter how it was determined Updates: tailscale/corp#29964 Updates: tailscale/corp#36446 Signed-off-by: Simon Law <sfllaw@tailscale.com>