Grafana difference between two datapoints












0















In a Graphana dashboard with several datapoints, how can I get the difference between the last value and the previouse one for the same metric?
Perhaps the tricky part is that the tiem between 2 datapoins for the same metric is not know.



so the desired result is the <metric>.$current_value - <metric>.$previouse_value for each point in the metricstring.



Edit:
The metrics are stored in graphite/Carbon DB.



thanks










share|improve this question

























  • Which data source are you using?

    – AussieDan
    Nov 23 '18 at 14:48











  • The metrics are stored in graphite/Carbon DB.

    – Lou_Ds
    Nov 24 '18 at 0:32
















0















In a Graphana dashboard with several datapoints, how can I get the difference between the last value and the previouse one for the same metric?
Perhaps the tricky part is that the tiem between 2 datapoins for the same metric is not know.



so the desired result is the <metric>.$current_value - <metric>.$previouse_value for each point in the metricstring.



Edit:
The metrics are stored in graphite/Carbon DB.



thanks










share|improve this question

























  • Which data source are you using?

    – AussieDan
    Nov 23 '18 at 14:48











  • The metrics are stored in graphite/Carbon DB.

    – Lou_Ds
    Nov 24 '18 at 0:32














0












0








0








In a Graphana dashboard with several datapoints, how can I get the difference between the last value and the previouse one for the same metric?
Perhaps the tricky part is that the tiem between 2 datapoins for the same metric is not know.



so the desired result is the <metric>.$current_value - <metric>.$previouse_value for each point in the metricstring.



Edit:
The metrics are stored in graphite/Carbon DB.



thanks










share|improve this question
















In a Graphana dashboard with several datapoints, how can I get the difference between the last value and the previouse one for the same metric?
Perhaps the tricky part is that the tiem between 2 datapoins for the same metric is not know.



so the desired result is the <metric>.$current_value - <metric>.$previouse_value for each point in the metricstring.



Edit:
The metrics are stored in graphite/Carbon DB.



thanks







dashboard grafana difference graphite graphite-carbon






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 24 '18 at 0:32







Lou_Ds

















asked Nov 23 '18 at 14:15









Lou_DsLou_Ds

181115




181115













  • Which data source are you using?

    – AussieDan
    Nov 23 '18 at 14:48











  • The metrics are stored in graphite/Carbon DB.

    – Lou_Ds
    Nov 24 '18 at 0:32



















  • Which data source are you using?

    – AussieDan
    Nov 23 '18 at 14:48











  • The metrics are stored in graphite/Carbon DB.

    – Lou_Ds
    Nov 24 '18 at 0:32

















Which data source are you using?

– AussieDan
Nov 23 '18 at 14:48





Which data source are you using?

– AussieDan
Nov 23 '18 at 14:48













The metrics are stored in graphite/Carbon DB.

– Lou_Ds
Nov 24 '18 at 0:32





The metrics are stored in graphite/Carbon DB.

– Lou_Ds
Nov 24 '18 at 0:32












1 Answer
1






active

oldest

votes


















1














You need to use the derivative function




This is the opposite of the integral function. This is useful for taking a running total metric and calculating the delta between subsequent data points.



This function does not normalize for periods of time, as a true derivative would. Instead see the perSecond() function to calculate a rate of change over time.




Together with the keepLastValue




Takes one metric or a wildcard seriesList, and optionally a limit to the number of ‘None’ values to skip over.



Continues the line with the last received value when gaps (‘None’ values) appear in your data, rather than breaking your line.




Like this



derivative(keepLastValue(your_mteric))


A good example can be found here http://www.perehospital.cat/blog/graphite-getting-derivative-to-work-with-empty-data-points






share|improve this answer
























  • Many thanks, this works. Great Idea. :)

    – Lou_Ds
    Nov 28 '18 at 8:50






  • 1





    @Lou_Ds Sure! good luck :)

    – Gal S
    Nov 28 '18 at 9:11











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









1














You need to use the derivative function




This is the opposite of the integral function. This is useful for taking a running total metric and calculating the delta between subsequent data points.



This function does not normalize for periods of time, as a true derivative would. Instead see the perSecond() function to calculate a rate of change over time.




Together with the keepLastValue




Takes one metric or a wildcard seriesList, and optionally a limit to the number of ‘None’ values to skip over.



Continues the line with the last received value when gaps (‘None’ values) appear in your data, rather than breaking your line.




Like this



derivative(keepLastValue(your_mteric))


A good example can be found here http://www.perehospital.cat/blog/graphite-getting-derivative-to-work-with-empty-data-points






share|improve this answer
























  • Many thanks, this works. Great Idea. :)

    – Lou_Ds
    Nov 28 '18 at 8:50






  • 1





    @Lou_Ds Sure! good luck :)

    – Gal S
    Nov 28 '18 at 9:11
















1














You need to use the derivative function




This is the opposite of the integral function. This is useful for taking a running total metric and calculating the delta between subsequent data points.



This function does not normalize for periods of time, as a true derivative would. Instead see the perSecond() function to calculate a rate of change over time.




Together with the keepLastValue




Takes one metric or a wildcard seriesList, and optionally a limit to the number of ‘None’ values to skip over.



Continues the line with the last received value when gaps (‘None’ values) appear in your data, rather than breaking your line.




Like this



derivative(keepLastValue(your_mteric))


A good example can be found here http://www.perehospital.cat/blog/graphite-getting-derivative-to-work-with-empty-data-points






share|improve this answer
























  • Many thanks, this works. Great Idea. :)

    – Lou_Ds
    Nov 28 '18 at 8:50






  • 1





    @Lou_Ds Sure! good luck :)

    – Gal S
    Nov 28 '18 at 9:11














1












1








1







You need to use the derivative function




This is the opposite of the integral function. This is useful for taking a running total metric and calculating the delta between subsequent data points.



This function does not normalize for periods of time, as a true derivative would. Instead see the perSecond() function to calculate a rate of change over time.




Together with the keepLastValue




Takes one metric or a wildcard seriesList, and optionally a limit to the number of ‘None’ values to skip over.



Continues the line with the last received value when gaps (‘None’ values) appear in your data, rather than breaking your line.




Like this



derivative(keepLastValue(your_mteric))


A good example can be found here http://www.perehospital.cat/blog/graphite-getting-derivative-to-work-with-empty-data-points






share|improve this answer













You need to use the derivative function




This is the opposite of the integral function. This is useful for taking a running total metric and calculating the delta between subsequent data points.



This function does not normalize for periods of time, as a true derivative would. Instead see the perSecond() function to calculate a rate of change over time.




Together with the keepLastValue




Takes one metric or a wildcard seriesList, and optionally a limit to the number of ‘None’ values to skip over.



Continues the line with the last received value when gaps (‘None’ values) appear in your data, rather than breaking your line.




Like this



derivative(keepLastValue(your_mteric))


A good example can be found here http://www.perehospital.cat/blog/graphite-getting-derivative-to-work-with-empty-data-points







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 27 '18 at 14:00









Gal SGal S

757213




757213













  • Many thanks, this works. Great Idea. :)

    – Lou_Ds
    Nov 28 '18 at 8:50






  • 1





    @Lou_Ds Sure! good luck :)

    – Gal S
    Nov 28 '18 at 9:11



















  • Many thanks, this works. Great Idea. :)

    – Lou_Ds
    Nov 28 '18 at 8:50






  • 1





    @Lou_Ds Sure! good luck :)

    – Gal S
    Nov 28 '18 at 9:11

















Many thanks, this works. Great Idea. :)

– Lou_Ds
Nov 28 '18 at 8:50





Many thanks, this works. Great Idea. :)

– Lou_Ds
Nov 28 '18 at 8:50




1




1





@Lou_Ds Sure! good luck :)

– Gal S
Nov 28 '18 at 9:11





@Lou_Ds Sure! good luck :)

– Gal S
Nov 28 '18 at 9:11


















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