After upgrading from Netdata v1.37 to v1.44 I noticed that the Dygraphs charts on a custom dashboard were showing values older than 30 minutes with a straight line on data sampled at successive 30’ intervals. Scrolling the timeline restores full resolution, while clicking on “Chart Reset” goes back to the 30’ sampling. How can I have the timelines always plotted without coarse sampling?
Here is the chart’s definition and its appearance with and without interpolation.
<div data-netdata="H.temperature"
data-dygraph-title="Temperature"
data-colors="#000080 #ff0000"
data-after="-7200"
data-before="0"
data-height="10em"
data-host="http://example.com:19999/"></div>
I searched for a parameter to tweak by looking in the Netdata documentation, the Dygraphs documentation and also for dataattribute in the dashboard source code, but didn’t find a setting that seemed relevant.