Bevy manages the certificates for all sites.

What are managed certificates?

The managed certificates are SSL certificates provided by Google Cloud and renew automatically in the customer instances on behalf of Bevy.

What is the CA used to issue the certificate?

The CA used will be the Google CA known as “Google Trust Services” (GTS Root R1), for more information about this CA see: Google Trust Services | Home

This is what a certificate issued by GTS looks like:

Would it be possible to use a different CA than Google CA?

Not at the moment.

How often are the certificates renewed?

Google Cloud provisions managed certificates valid for 90 days. About one month before expiry, the process to renew your certificate automatically begins.