certbot: remove one certificate from automatic renewals

certbot-stop-renewing-one-certificate.txt

The delete command will remove the cert from the server along with the assoicated letsencrypt files for that certificate.  

# certbot delete --cert-name certtoremove.tld 
  OR 
  just run
  
# certbot delete

Running certbot delete with no options leads to a nice numbered list of all certificates .
Choose the certs to be removed by number ( comma or space separated ) but note - blank answer will remove all certs supposedly so be careful.

In order to prevent renewals yet retain the certificate and files simmply 
rename or move the single relevant file in /etc/letsencrypt/renewal/ for that certificate

ie. 
mv /etc/letsencrypt/renewal/oldcertdomain.tld.conf /etc/letsencrypt/renewal/oldcertdomain.tld.txt

See https://stackoverflow.com/questions/40030537/how-to-stop-renewing-a-letsencrypt-certbot-certificate 
and
https://eff-certbot.readthedocs.io/en/stable/using.html#certbot-command-line-options