The status icon (circle) by the PMU name on the Graph and Device measurements displays do not indicate a there is a connection failure of the stream or pmu unless the user navigates away and then back to the display.
 
To replicate: Stop an input stream into the openPDC while on the Graph or Device measurements page. (This can be replicated with Shelby from one openPDC to another openPDC). The status icon will remain green even though the connection/pmu stream is disconnected. Status does not change even when the refresh interval passes. Only when navigating away and back will the display correctly show the state of the connection.