Incorrect graph offset with nonNegativeDerivative about grafana

[torkelo]

Try changing the null point mode from connected to null or null as zero. Might improve the result, others have reported an issue with the auto scaling of the y axis, (will investigate), try setting the X axis min to zero

[masterzen]

Using null as zero seems to fix the issue. It's like grafana was mistakenly using 0 as null when getting the data from graphite. I inspected the json returned by graphite and indeed I see 0.0 for the values that where mistakenly found as 1.0 in the above graph...

Also note that for some graph time settings (like 5m, or 15m) all zeros above or before the last values are not drawn:

Here are the values returned by graphite for drawing this last graph:

[{"target": "nonNegativeDerivative(async.server8.push.apple.sent.count)", "datapoints": [
[null, 1391097510], [1.0, 1391097520], [0.0, 1391097530], [0.0, 1391097540], [0.0, 1391097550], 
[0.0, 1391097560], [0.0, 1391097570], [0.0, 1391097580], [0.0, 1391097590], [0.0, 1391097600], 
[0.0, 1391097610], [0.0, 1391097620], [0.0, 1391097630], [0.0, 1391097640], [0.0, 1391097650], 
[0.0, 1391097660], [0.0, 1391097670], [0.0, 1391097680], [0.0, 1391097690], [1.0, 1391097700], 
[0.0, 1391097710], [0.0, 1391097720], [0.0, 1391097730], [0.0, 1391097740], [0.0, 1391097750], 
[0.0, 1391097760], [0.0, 1391097770], [0.0, 1391097780], [0.0, 1391097790], [null, 1391097800]]}]

It's possible those problems are related...
Thanks for the fast answer and really good job on this project!