Exporting a Sum Metric for Prometheus

[michael-cybrid]

I'd like to export a counter metric, via opentelemetry-collector, to prometheus but am running into issues.

The docs seem to indicate that only delta sums are support but if I define OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE as cumulative, the exported data points have that set properly.

What I'm running into is that I don't see how I can create a counter with is_monotonic set, which looks to be a prerequisite for Prometheus ingestion. I can see in other languages that this is supported. Is there a way to do this?

[xuan-cao-swi]

Hi @michael-cybrid , as current counter implementation (and sum aggregation), there is no feature that support monotonic operation. I have opened an issue about this feature enhancement.