• Some notifications cleanups:
  • notifications about errors no longer change the status of the ongoing renewal.
  • notifications about a successful renewal are re-attempted on failure, just like
    other failures cause a retry with a backing-off delay.
  • warnings about expiring certificates are only sent, if there is no renewal
    already done (but maybe not activated yet) for a domain
  • failure to notify about expiring certficates also cause retry and are cleared
    when/if finally successful.