This came up as a result of https://www.digicert.com/support/certificate-revocation-incident
Does ATS check revocation status of origin certificates? If not, should it be a configuration setting to do so?
Regarding which method to use, this recent post from Let's Encrypt indicates OCSP (not stapling) on the way out and CRLs are in fashion again: https://letsencrypt.org/2024/07/23/replacing-ocsp-with-crls.html