I got an email that had me worried here for a minute, starting with
Your certificate (or certificates) for the names listed below will expire in 19 days (on 2023-11-28). Please make sure to renew your certificate before then, or visitors to your web site will encounter errors.
I'd initially gotten a certificate for two names, and later rolled in with a new one to add a third; the one with three is renewing appropriately. It might not be bad to include a little disclaimer in the email, perhaps something like:
You may have replaced this certificate with another, perhaps covering a larger set of names. This notification only covers the certificate last issued {date} for these names.
Such a note is already included, though worded differently:
For details about when we send these emails, please visit: Expiration Emails - Let's Encrypt In particular, note that this reminder email is still sent if you've obtained a slightly different certificate by adding or removing names. If you've replaced this certificate with a newer one that covers more or fewer names than the list above, you may be able to ignore this message.