How can I unsubscribe from certificate expiration notifications for a specific certificate?

This has recently been clarified in the new MRSP that prompted Upcoming changes to revocation reasons.

Let's Encrypt also now documents their new revocation policy here:

Let's Encrypt does not allow the usage of affiliationChanged in any case. You must use cessationOfOperation.

Let's Encrypt has discussed their reasoning for this on MDSP here: https://groups.google.com/a/mozilla.org/g/dev-security-policy/c/m3-XPcVcJ9M/m/1ACibMBYAAAJ

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