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* fix(telegram): enable TCP keepalive on getUpdates connections to prevent NAT timeout stalls Long-polling connections to api.telegram.org stay idle for up to the getUpdates timeout (~900 s). Most home/office NAT tables expire idle TCP entries after 60–1800 s (commonly ~1000 s). When the NAT entry is silently dropped the connection hangs rather than returning an error, leaving the grammY runner stuck until the 90 s stall watchdog fires and forces a restart cycle. Fix: unconditionally set `keepAlive: true` and `keepAliveInitialDelay: 30_000` (30 s) on the undici Agent `connect` options built in `buildTelegramConnectOptions`. OS-level TCP keepalive probes sent every ~75 s (OS default) will: 1. Refresh the NAT table entry before it expires. 2. Surface dead connections immediately with ETIMEDOUT instead of hanging forever. The `return Object.keys(connect).length > 0 ? connect : null` guard is also removed; `connect` is now always non-empty so it always returns the object. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> (cherry picked from commit 92e454c0614256201cdf6f0f73c7897d006616d4) * fix(telegram): stop self-flagging disconnected on poll-cycle start; widen channel connect grace to 300s (cherry picked from commit 1ca963a05dac0d9d605e9a15dc97fced9cf7725e) * fix(telegram): catch hung polling startups that preserve inherited connected:true The widened 300s channel connect grace and the removal of connected:false from notePollingStart left a path where a polling restart could hang forever looking healthy. notePollingStart clears lastConnectedAt, lastEventAt, and lastTransportActivityAt but deliberately omits connected, so server-channels' patch-merge inherits a connected:true from the previous lifecycle. After grace, evaluateChannelHealth's stale-socket branch requires lastTransportActivityAt to be non-null and the connected:false branch is masked, so the channel sits healthy with no first getUpdates. Add a post-grace branch to evaluateChannelHealth that flags polling channels as stale-socket when connected:true is paired with null lastConnectedAt and null lastTransportActivityAt and a non-null lastStartAt. Scoped to mode:polling so webhook channels and channels without continuous transport tracking are not falsely flagged. Align TELEGRAM_POLLING_CONNECT_GRACE_MS in the Telegram status diagnostic with DEFAULT_CHANNEL_CONNECT_GRACE_MS so openclaw channels status agrees with the shared health monitor on the grace window. Refresh the notePollingStart comment to point at the new evaluateChannelHealth branch. Addresses clawsweeper review on #83304 (P1 connect-grace startup-hang, P2 diagnostic grace drift). Tests cover the new flagged path, the in-grace happy path, and the prior-successful-connect happy path. * fix(telegram): clear polling connected state on startup * fix(gateway): add defense-in-depth health-policy branch for hung polling startups Defense in depth on top of 87db46c576's notePollingStart connected:false fix. The primary path (notePollingStart writes connected:false explicitly so evaluateChannelHealth's existing connected===false branch catches a hung restart) is unchanged. This adds a defensive post-grace branch that catches the same hang via a different signature -- inherited connected:true paired with null lastConnectedAt and null lastTransportActivityAt -- in case a future code path forgets to clear the inherited connected flag on lifecycle start. Scoped to mode:polling so webhook channels and channels without continuous transport tracking are not falsely flagged. Also bump lastStartAt: Date.now() - 121_000 to 301_000 in the spool-handler timeout test added by upstream #83505 so it falls past the widened 300s TELEGRAM_POLLING_CONNECT_GRACE_MS suppression window (mirroring the same fixup already applied to the two adjacent polling-startup tests). * revert(telegram,gateway): keep connect grace at 120s Drop the 120s -> 300s widening from this PR after maintainer feedback that the extra grace masks real startup bugs. The defense-in-depth checks added in earlier commits (notePollingStart clearing inherited connected state, the stale-socket policy branch, the per-snapshot startup grace test) all work fine at 120s and remain valuable on their own. Reverts in: - src/gateway/channel-health-policy.ts: DEFAULT_CHANNEL_CONNECT_GRACE_MS 300 -> 120 - extensions/telegram/src/status-issues.ts: TELEGRAM_POLLING_CONNECT_GRACE_MS 300 -> 120 - extensions/telegram/src/status.test.ts: lastStartAt 301_000 -> 121_000 (3 cases) The new channel-health-policy.test.ts cases use explicit channelConnectGraceMs: 10_000 in the policy, so they are unaffected by the default constant change. * fix(telegram): narrow polling keepalive fix --------- Co-authored-by: Yibei Ou <yibeiou@Yibeis-Mac-mini.local> Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com> Co-authored-by: Ayaan Zaidi <hi@obviy.us>