I have a seemingly simple problem that I’ve been stuck on for hours. I have a counter and want to know by how much the counter increases per period and plot that in chronograf:

```
from(bucket: "volkszaehler")
|> range(start: dashboardTime)
|> filter(fn: (r) => r.title == "HcStarts")
|> filter(fn: (r) => r._field == "value")
|> aggregateWindow(every: 1d, fn: max)
|> derivative(unit: 1d, nonNegative: true, columns: ["_value"])
```

Only I can’t use `max`

since its not an aggregate function. Trying to use derivative first and the sum inside the aggreagteWindow didn’t work either.

How would I do this?