Getting line connected points over a series

[torkel]

that is super strange, not aware of this issue ever happening with graphite (if you change null value mode, or add transformNull function).

Can you investigate the raw data being returned by Graphite?

How to troubleshoot metric query issues

If you get a panel query error or not seeing the data you expect to see the most important thing to do is view the query Grafana sends to your database and what the raw response is. This information is not built into Grafana yet but can be easily investigated using Browser Dev Tools. To open Chrome Dev Tools (F12, Ctrl+Shift+I on windows, Cmd+Opt+I on Mac), go the network tab. Hit refresh on the Grafana dashboard so Grafana sends a new data query. Try to find the query in the list of network c…