Determine Domain Validation method

I received a notification that one of the several domains that I have a Let’s Encrypt certficate on is using the ACME TLS-SNI-01 domain validation.

Since I have multiple domains using Let’s Encrypt, all associated with the same email address, is there anyway to determine which validation method is used when I am ssh’d in to the server?

Yes, grep through the files in the /etc/letsencrypt/renewal/ folder.
Look for standalone or tls

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