Currently, each CT log must have a unique URL. Adding the same log twice is not permitted by EJBCA, even if the second log has a different label. A customer has requested the ability to add the same log to multiple CT log groups, e.g. two CT logs with the same URL should be permitted if they have different labels.
When introducing this change, we make sure that we only submit a certificate to a CT log once, even when the CT log appears under multiple labels. There should be test for this.
The necessary checks must be applied both when a new log is added and when an existing log is edited.