severity 849971 important thanks Hello.
I'm setting the severity of this bug to "important" not because I don't think it is not RC (as Release Policy still says that packages must autobuild *without* failure), but because the Release Managers are considering to decide about RC-ness of this kind of bugs based on the probability of failure. We don't know what kind of threshold there will be for stretch, so I strongly recommend that you act as if this bug was serious and RC, especially if the failures happen very often on any kind of autobuilder which is not misconfigured. Thanks.