Add metrics for revocation information provided via Certificate Revocation Lists #189
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CA/B Forum Ballot SC-063 v4 (details) makes OCSP optional in favor of CRLs, which have regained traction in the past few years. Let's Encrypt has also announced that they will be phasing out OCSP in favor of CRL. As such, usage of CRLs as a revocation declaration mechanism is expected to increase. To handle this, this PR introduces support for retrieving and exposing revocation information for certificates using Certificate Revocation Lists.
In the files I've modified I also noticed that the deprecated
io/ioutilis still in use, so I took the liberty of replacing calls toioutilfunctions with their modern counterpart. This is admitedly unrelated to the CRL support, so I can remove 4dae54f, or if desired I can also replaceioutilcalls in the rest of the files in the project.