Timecharting the sum() of min()/avg()/max()

[jeffa]

I'm sure there is an easy answer for this and I'm going feel silly when I see it. I have a scripted input that pulls volume data for several volumes every 5 minutes. I would like to see the change in used terabytes of the combined volumes over time (each volume has a used_tb key/value pair in the log). For short timeperiods, I can do...

... | timechart span=5m sum(used_tb)

but when once I need to go beyond the last 24 hours, this breaks down. I can do...

... | timechart span=1h min(used_tb) by volume

and then use an area graph in stacked mode to get the idea, but I can't get an accurate measure when I hover over the graph (the pop up is for the individual volumes).

I thought that nesting the functions...

... | timechart span=1h sum(min(used_tb) by volume)

would work, but this produces no values.

What really easy thing am I missing here?

[ziegfried · Accepted solution]

This one should work:

... | bucket _time span=1h | stats min(used_tb) as min_used by volume,_time | timechart span=1h sum(min_used)

[jeffa]

Brilliant! That did the trick.

[ziegfried]

forgot to add time to the split-by clause of the stats. modified the search in the answer...

[jeffa]

That search still doesn't produce any charting results. I have played w/ bucketing and eval but no luck.