Caches failed service probes - #22944

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NickSdot wants to merge 8 commits into

NickSdot:perf/cache-test-service-probes

Commits on Aug 4, 2026

Cache and bound failed PDO connection probes
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9bd6ffe
Cache failed SNMP agent probes
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77f3b93
review: switched service probe fixture cleanup to --CLEAN--
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86347ed
Share failed service probes across tests
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24eb85e
review: replaced `is_resource()` check
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9735f13
review: always throw new exception
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1ad2bda
review: introduced `ProbeFailureException`
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9678f91
fix: adjusted test assertions
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03845a0