Add AIA certificate prober to boulder-observer#8594

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Copilot wants to merge 13 commits intoobserver-ctxfrom

copilot/add-aia-certificate-prober

Commits on Feb 4, 2026

Initial plan

Copilot
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Add AIA certificate prober implementation with tests

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Add AIA prober documentation and configuration example

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Add integration tests for AIA prober Probe method

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Fix timeout handling and nil pointer check in AIA prober

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Fix formatting in AIA prober

Copilot
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Add AIA to Kind validation tag in mon_conf.go

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Add ExpectCommonName field and CA certificate validation

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Make ExpectCommonName required and add debug logging

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Inline calls to conf.Instrument() when possible

mcpherrinm
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Check the cNotBefore and cNotAfter values

mcpherrinm
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Drop logs

mcpherrinm
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Make AIA observer and tests more idiomatic
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