Perhaps I was unclear. I only want to graph "last time we got data", as this should increase every ten minutes. I want to make a graph that shows when this doesn't increase, and highlight areas where it doesn't increase for a certain threshold of time. This appears possible with rrdtool, to me at least.
For example, imagine data like this: time | updated ------------------------------------------ 04301210 | 04301140 ( Apr 30 at 12:10PM, the most recent data is 11:40AM) 04301220 | 04301150 ( Apr 30 at 12:20PM, the most recent data is 11:50AM) 04301230 | 04301150 ( ten minutes later, the most recent data is still 11:50AM, unchanged) Could rrdtool handle this? Thanks, Grant
I would suggest that if all you want is "last time we got data" then rrdtools are not the best way to do it If you are plotting something that comes out of the weather stations (for example temperature) and only update an rrd database when you have data, then you will naturally get a gap in the graph. If you did plot time, then you would also find yourself with a gap (whether you plotted 'time' as an increasing number, or 'rate of change of time' as a straight horizontal line). In both cases, this is because when you miss data, the rrd will end up containing NAN (Not A Number) and the graphing will (by default) not draw a line at all. _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
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