fix(pipeline): soften idle keepalive backoff#1325
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Previous cap of 2s caused ~1200 requests/5min idle with 15 deployments. New escalation: 20ms→80ms→200ms→500ms→2s→5s→10s→20s. After 15+ consecutive empties, sessions poll every 20s. Estimated idle reduction: ~1200/5min → ~200/5min. Zero latency impact on active traffic — select! races timer against client reads, so real data fires immediately. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
…mpties The previous idle_tier > 1 threshold stopped polling after just 2 empty responses, starving server-initiated data (push notifications, responses) until the client happened to send something. This widens the ramp so the tunnel keeps polling through early idle tiers and only goes full-stop after 5 consecutive empties. Any server response now fully resets idle state instead of barely recovering on small payloads. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
idle_tier > 1(2 empties) toidle_tier > 4(5 empties) — the tunnel was going silent too fast, starving server-initiated dataidle_tierto 0 — previously small payloads (<1KB) barely recovered idle stateall_legacygate from fix(pipeline): stop idle keepalive polls, reduce idle requests #1322 so mixed fleets keep polling for long-poll peersTest plan
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