With stacked series (“Graph theses queries as a; b”) or grouped queries (“avg by host”), you’ll have several metric lines on the same graph and you may occasionally see some graph lines dropping back to 0:
You can see from the graph legend “N/A” (or by graphing the serie alone in a graph) that there is actually no data at these times.
Instead of displaying nothing, our system displays 0s and this really improves the visualization for:
This feature might be changed in the future. For now, if you find it confusing you may use the following solutions to reduce its visual impact (short data gaps only):