Component(s)

receiver/prometheus

What happened?

Description

Native histograms with custom buckets should be converted to explicit Otel histograms, not exponential Otel histograms with fake schema -53.

See https://prometheus.io/docs/specs/native_histograms/#custom-values

Steps to Reproduce

Add unit test to enable Prometheus parsing to produce NHCB.
Enable the native histograms feature gate.
No need for protobuf input, normal text will work.

Expected Result

Explicit histogram metric on Otel side.

Actual Result

I expect invalid exponential histogram.

Collector version

v0.128.0

Environment information

Environment

OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")

OpenTelemetry Collector configuration

Log output

Additional context

No response

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