When the gateway receives SIGTERM, runner.stop() stops the grammY polling
loop but does not abort the in-flight getUpdates HTTP request. That request
hangs for up to 30 seconds (the Telegram API timeout). If a new gateway
instance starts polling during that window, Telegram returns a 409 Conflict
error, causing message loss and requiring exponential backoff recovery.
This is especially problematic with service managers (launchd, systemd)
that restart the process immediately after SIGTERM.
Wire an AbortController into the fetch layer so every Telegram API request
(especially the long-polling getUpdates) aborts immediately on shutdown:
- bot.ts: Accept optional fetchAbortSignal in TelegramBotOptions; wrap
the grammY fetch with AbortSignal.any() to merge the shutdown signal.
- monitor.ts: Create a per-iteration AbortController, pass its signal to
createTelegramBot, and abort it from the SIGTERM handler, force-restart
path, and finally block.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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