>>It doesn't cost any extra to renew before the final 30 days of a cert, it can be considered good practice to do so. In that case you would never see the warnings.
>
>The specific domain I am making reference to will not be renewed. So, in such case, even at the registrar level, I would also like to stop being notified about such domain about to expire.
If you can't delete/remove the cert because you need it until it expires, that's an edge case I haven't previously encountered. I don't know how you might disable those warnings. And really you don't want to disable all warnings, just those for the one cert.
As for warnings from your domain registrar, you would need to either de-register the domain or contact them to stop warning you about expiration.
Regards. Al
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