severity 849971 important
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.