[Feature] Write network inaccessibility to the graph

[matsudayoji]

Is your feature request related to a problem? Please describe.
Not a problem

Describe the solution you'd like
I would like to see if the network was down on the graph.

Additional context
For example, now when network is down you can only see this in Results report and nothing on Dashboard

[cillgen]

Any schedule for this feature ?

[svenvg93]

check out #2578, no ETA yet.