With the change from "Let's Encrypt" to Google certs, some Ruby customers are reportedly seeing the following warning in their application logs:
MONGODB | TLS certificate of '{server_url}' could not be definitively verified via OCSP: For responders '{cert_issuer_url}' with a timeout of 9.925218007003423 seconds: OCSP response from '{cert_issuer_url}' is 6: unauthorized
(For one example, see https://github.com/mongodb/mongo-ruby-driver/discussions/2940)
There is a chance this is due to some non-compliance with the OCSP spec in the Ruby driver. We need to investigate to (1) determine if that is the case, and if so, (2) fix it.