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e9e209673e
suggestExitNodeLocked now ranks exit node candidates using the per-region latency tracked by the netcheck Client (RecentRegionLatency), which merges the reports retained in c.prev. That history is only useful for far-away regions if it contains a full netcheck report, since incremental reports only re-probe the home region and a handful of the fastest ones. The full-report cadence in GetReport and the c.prev retention window were two independent 5-min constants - the way we schedule netchecks ensured that the history always contaned a full report, but it was not a strong contract and we did not have any checks around this. Now full report interval and retention window are driven by the same var, and a test confirms that the history contains a full report. Updates tailscale/corp#17516 Signed-off-by: Anton Tolchanov <anton@tailscale.com>