Comment 1 for bug 1718259

The pgsql interface is not container scoped and does not function correctly if used as a container scoped relation, which is why telegraf does not try to declare it as container scoped.

As best I can tell, what should happen when one end of a relation declares the scope as container and the other as global is undefined (although it does happen to work with many simpler relations). For PostgreSQL, the particular problem is that the relation becomes container scoped and the PostgreSQL units are unable to see their peers, breaking the implementation because the standby units never see the master unit join the relation.