To help people test their clients ahead of the deprecation date, we’re going to disable the TLS-SNI-01 method in staging on 2019-01-22 (this Tuesday). Once that’s live we’ll post an update here, and you’ll be able to run certbot renew --dry-run, which will do a test against staging. If the dry run succeeds, you’ll know that you’re ready for the deprecation date.
Thanks,
Jacob