github.com/letsencrypt/boulder@v0.20251208.0/precert/testdata/README.md (about)

     1  The data in this directory consists of real certificates issued by Let's
     2  Encrypt in 2023. The ones under the `bad` directory were issued during
     3  the Duplicate Serial Numbers incident (https://bugzilla.mozilla.org/show_bug.cgi?id=1838667)
     4  and differ in the presence / absence of a second policyIdentifier in the
     5  Certificate Policies extension.
     6  
     7  The ones under the `good` directory were issued shortly after recovery
     8  from the incident and represent a correct correspondence relationship.