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Yuri Khachaturyan
2b1308ca29
Problem: a flaky outbound produces hundreds of false-positive "outbound down" notifications overnight — each fires the moment xray's observatory reports a single failed probe, and the next successful probe fires an "up". applyObservatory forwarded every raw alive:true->false transition straight to EventOutboundDown; xray's observatory has effectively no hysteresis, and nothing on the panel side debounced it (the email/Telegram subscribers are pure formatters). Fix: debounce per outbound. outbound.down now fires only after outboundDownThreshold consecutive FAILED probes (new setting, default 3); outbound.up fires immediately on the first successful probe and only when a down was actually notified. The threshold gates the event itself, so email and Telegram share one knob (exposed next to the outbound.down toggle). The streak counts genuinely new probes (last_try_time advancing), not sampler polls — the sampler runs every 2s but the observatory re-probes per its probeInterval, so counting samples would trip the threshold instantly. outboundDownThreshold=1 reproduces the legacy notify-on-first-failure behaviour. Tuning the observatory's probe interval/timeout is not a workaround: those probes also drive the load balancer's outbound selection, so loosening them to quiet notifications would slow real failover away from a genuinely dead outbound. Notifications don't need observatory-grade latency, so the tolerance belongs at the notification layer, leaving the observatory (and balancer) untouched. Adds TestApplyObservatoryDebounce covering the threshold, probe-vs-sample counting, single-blip suppression and the legacy path. Co-authored-by: Yuriy Khachaturian <y.khachaturian@souzmult.ru> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>