The per-IP httpx transports were built once in __init__ and never torn
down. A connect that reached ESTABLISHED and was then closed by the peer
left its socket in CLOSE_WAIT inside the pool, and the failure path only
logged and continued — so the poisoned pool was retained and leaked one
descriptor per retry.
With DNS for api.telegram.org failing, every poll fell through to the
seed IP and leaked another fd every ~2.5s. The bot gateway reached 177
CLOSE_WAIT sockets against launchd's 256 soft limit and wedged: accept()
on the gateway port, config reads and DNS resolution all failed with
EMFILE, which in turn made the primary path fail and fed the loop.
Build fallback transports lazily and discard them on a retryable connect
failure, and bound every pool at 8 connections (httpx defaults to 100,
so two seed IPs plus primary could alone exceed the fd ceiling).
Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)
Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>
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