[rrd-users] time as a counter?

[Simon Hobson]

Grant Kelly wrote:
>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?

Yes, as long as you keep feeding in the time. If you stop feeding in 
the last-update time then you will get gaps in the data.