stack limit in histogram?

[hsmith]

Is that going to be your talk at NWC?

[_asp_]

strange. If I enable fill zero the stack problem is going away.

But what I do not understand:
I suppose only to be items considered to mean calculation where the field is present. Even if I set the interval to 5 minutes where **always** multiple matches are present, the system should be able to calculate the mean value.

So I have a valid value all the time, kibana should be able plot all lines without having to deal with null values.

[hsmith]

From what it sounds like, it's working as intended. You can't calculate a mean on a null. I don't know if this is something we're going to be able to change/fix.

[_asp_]

but I do not understand, where the value null is coming from.

see, lets say, i have following events with following values:

minute: value
1: 10
3: 0
4: 6
5: 3
6: 0
8: 0
9: 21
10: 45
11: 54
13: 0
14: 15

That's how it looks like in detail:
We have a probe each minute, each 5 minute the whole event is missing, not only the field.
So you have missing events on minutes 2, 7, 12.

If I go for 1 minute interval, I agree to you, that the algorythm will have intervals, which have no values. That might cause plotting problems.
But If i set interval to 5 minutes, than it allways have valid values:
interval 1 (minutes 0-5 = (10+0+6+3)/4)) -> mean of 4 events
interval 2 (minutes 6-10 = (0+0+21+45)/4) -> mean of four events

That's how I expect it to work and see no problem here as long as there are events in the interval size set in panel.
Also I'd expect - if fill zero is not checked - that the line has gaps for the intervals where the mean value could not be processed (e.g. by division by zero) or that the gaps are replaced by a direct line between previous and next valid values.

[hsmith]

I can put in a feature request to change how it functions when zero fill is not checked, but I don't know if this is something that would be implemented or not.

[_asp_]

In my opinion its a bug and not a feature request.
But if you do not accept it as bug, please add a feature request.

[hsmith]

swilkerson is out of the office for a couple more days. When he returns I'll see what he deems appropriate for this once, as he was working with you on it a bit.