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Report what is left when the chaos test does not settle - #1023
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hackney_pool_chaos_tests sometimes fails its settle check on CI (seen since 2026-10-25) and has never failed locally or in 60 instrumented CI runs. On that failure, print the pool stats and non-empty maps, the state and stack of every live connection, and whether it settles later, so the next occurrence shows the cause.
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hackney_pool_chaos_tests sometimes fails its settle check on CI (seen on master since 2026-10-25, Linux and FreeBSD) and has not failed locally or in 60 instrumented CI runs, so the cause is still unknown. On that failure the test now prints the pool stats and non-empty maps, the state and stack of every live connection, and whether it settles given 30 s more, so the next occurrence shows whether it is a slow teardown or a leak. Test-only change.