today i found that the exported data from a csv export is not the same which provided by the datasource to the graph panel.
i know that the graph panel make “data tuning” for better visualisation, but my expectation for the CSV export was that the “raw” data will be exported.
Is there a way to achieve this?
What do you mean by “data tuning”? Grafana mostly just shows the data returned from the query (there are a few exceptions like aggregation options in the SingleStat panel).
sorry, you are right. at the visualisation everything works fine
The problem is actualy just exporting data as columns, here are the datapoint not correctly merged.
I attached a screenshot to clarify it with example data.
At the left side shows a correct export as rows, at the right side you see an incorrect export as columns:
i made a new image to clarify it
you can see at the image, that the values from the first time series “dampfmenge abhitze” are set to timestamps of the second timeseries “temperatur vor Endkühler”
Thanks for the explanation. There is a bug report in Grafana that matches this (as there are no other reports, seems like this feature is not used much or this is an unusual bug):
I took a very small sample of data with just a few data points and exported to columns and it was correct.
If you zoom in on your graph and then do an export is the result still incorrect?
We have seen similar problems with data export. We are testing grafana v5.4.2. together with influxdb v1.5.2.
We also tried doing statistical evaluations of measurement time series (10-20s over several weeks). It’s temperature and flow rates (as impulse counts). The flow rate values should be summed up, too.
Our topics:
Basically the trend curves are looking alright (total zoom and zooming in).
But the values of the y-axe is changing depending on the zooming in the chart
With temperature values it’s obviously better.
baseline values of flow rate seem OK but not the maximum values.
then we tried total zoom for export data and further postprocessing.
But not the raw data were exported.Obviously the current(!) wrong display data were exported
This shouldn’t be.
cummulated curve: always chart data of current zoom window was summed up. Sorry, not useful.
default value should be: cummulative sum of all values not depending on the chart zooming
helpful enhancement: defining intervals of the curve that should be summed up. Is this possible?
Basically grafana is an interesting chart tool but getting reliable statistical results is necessary.
Thanks in advance.
Hermann