kevinveenbirkenbachandClaude Opus 5 d14354e892 feat(diagnostics): sample what the resolver answers, not just its socket ...

Run 32118850138 lost the :53 listener, so the sampler counts listeners.
Run 32538854067 lost DNS with the listener still bound: sockets-udp.txt
showed dnsmasq holding 0.0.0.0:53 while every forwarded query timed out,
and the sampler reported that hour as healthy.

Each tick now also records what a glibc caller gets back — for the zone
this resolver owns, derived from its own address= line, and for one name
it must forward — with the latency that caller paid. The rescue collector
probes the in-zone name too: probing external names alone cannot separate
"forwarding is gone" from "dnsmasq is gone".

The sampler now also runs on the swarm lab DNS nodes; it only ever ran in
the compose path, which is why the Magento artifact carried no sampler log
at all. Its location comes from group_vars FILE_DNS53_SAMPLER_LOG and is
required at every call site, so a run cannot quietly collect nothing.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2026-08-22 17:55:05 +02:00

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feat(diagnostics): sample what the resolver answers, not just its socket

2026-08-22 17:55:05 +02:00

__init__.py

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