You think that A/B expression is simple. It isn’t, because you don’t consider time dimension:
A, B generates times series:
So also C is timeseries = list of 1 with different timestamps.
But Gauge panel doesn’t visualize time dimension, so you need from list of values, just one, which will be show G\auge panel:
You selected total (sum), so I guess C is just list of 11x1, which are summed and showed as 11 in Gauge panel.
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