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feat(checks): warn when a dual-stack probe only answered on its fallback family - #852
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…ck family (fclairamb/solidping-business#69) The Happy Eyeballs race (0c5ccaf) keeps a lossy IPv6 path from making a dual-stack target look down; this spec restores the lost signal as a warning. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ack family Observe each connect attempt per family (httptrace); when the first family failed, or stayed silent for 1 s, while the other connected, the HTTP and Prometheus checks return a warning with output.ip_fallback and a message. A failure keeps its status; a pinned family never warns. Shown in the dashboard (result-ip-fallback) and documented. Closes fclairamb/solidping-business#69 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
…h on its fallback family should say so Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
…h on its fallback family should say so Adds checkhttp tests for the guard and stdlib dialer fallback paths and a Prometheus scrape fallback test; documents why the message says "this region". Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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Stacked on #848: merge it first.
What changed
warning(rolled up as degraded) when a dual-stack target only answered on its fallback family, e.g. IPv6 unreachable but IPv4 up (answers the "which family failed" part of the issue, the IPv4 fallback itself shipped in fix(egress): fall back to IPv4 when the IPv6 path hangs (Happy Eyeballs) #849). The result carriesoutput.ip_fallbackand the dashboard shows it. Pinned-family checks never warn.Decided by autopilot
Notes
FamilyFallbackThresholdif wanted.localhostcan now warn when::1is refused but127.0.0.1answers.Closes fclairamb/solidping-business#69