Does the OTel Collector support Prometheus server scraping exponential histograms?

[colmwilty]

Hi,

I'm trying to figure out how my Prometheus server can pull/scrape metrics from my OTel collector where exponential histogram metrics are instrumented by my app. Right now I see an error in the prometheusexporter component where it indicates that it can't handle exponential histogram conversion:

error [email protected]/accumulator.go:94 failed to translate metric {"kind": "exporter", "data_type": "metrics", "name": "prometheus", "data_type": "\u0004", "metric_name": "api.request.duration"}

I understand this is because the exponential histograms/native histograms are not currently supported by the Prometheus text format. Native histograms in Prometheus are supported in the protobuf-based exposition format.

Is there a way the OTel collector can support conversion of exponential histograms to native histograms in the prometheusexporter so that I can continue to use the pull model? Or do I need to use prometheusremotewrite component or use Prometheus OTLP receiver i.e. push model?