Integrations
Where Odau's evidence comes from. A source that is not connected stops counting toward an application's System Health, which is why disconnecting one is a decision rather than a switch.
Connected Sources
How A Source Counts
An application counts as integrated when it is linked to a source that is not disconnected. A degraded source still counts: it is returning errors, not returning nothing, and quietly dropping it would make the Operational Health figure disagree with the rule it states. The error is shown instead, so somebody can decide.
Disconnecting keeps the record of which applications a source reached, so reconnecting restores the coverage exactly. Nothing is unlinked.
Odau is not establishing these connections. There is no connector yet, so this page records what is connected rather than making it so, and adding a new source is not offered because that is what a connector would be for.