export and capture rest endpoint output for metrics calculation

[Ketan Talreja]

Hi All, 

I have a use-case where I need to collect rest endpoint output metric i.e. let's say the output/response of rest endpoint is some value which I need to export to prometheus for calculating how many times the endpoint returned the 'x' value 

For example - 

GET /<endpoint>/users - return list of users which need to be exported to prometheus for metric calculation 

Question - 

Does anyone know how would I capture the endpoint results values and export to prometheus? Do I need to consider implementing custom exporter to do this job? If yes, could you help in providing some samples. 

Thank you,

Ketan

[Julius Volz]

Yes, it sounds like you probably will need to build a custom exporter for that to transform your custom REST format into the Prometheus metrics format.

You can see a huge list of example exporters at https://prometheus.io/docs/instrumenting/exporters/, and general guidelines for writing exporters at https://prometheus.io/docs/instrumenting/writing_exporters/.

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[Julius Volz]

Btw., googling turned up https://github.com/project-sunbird/prometheus-jsonpath-exporter - I don't know this one at all, but if your REST endpoint serves JSON, it looks like you could use this existing exporter to convert the JSON format to Prometheus metrics via some configuration rules.

[Julius Volz]

Or for a custom JSON exporter, see https://www.robustperception.io/writing-json-exporters-in-python

[Julius Volz]

Oh, apparently we also have a JSON exporter in prometheus-community: https://github.com/prometheus-community/json_exporter

[Ketan Talreja]

Sure, thanks Julius, This is very helpful and I will try json_exporter too. 

Thank you!

Ketan

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