[pkg/translator/prometheusremotewrite] Implement Exponential Histogram downscaling

[kovrus]

Component(s)

pkg/translator/prometheusremotewrite

Is your feature request related to a problem? Please describe.

When converting the Exponential Histogram to Prometheus Native Histogram its data points will be dropped if their scale is not in the [-4, 8] range.

Describe the solution you'd like

Exponential Histogram data points should be downscaled to a scale accepted by Prometheus (range [-4,8]) if its scale is greater than 8.

Describe alternatives you've considered

Exponential Histogram data points can be dropped if their scales are greater than 8.

Additional context

See comments in open-telemetry/opentelemetry-specification#3079

[github-actions]

Pinging code owners:

• pkg/translator/prometheusremotewrite: @Aneurysm9

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[github-actions]

Pinging code owners for pkg/translator/prometheusremotewrite: @Aneurysm9. See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

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Pinging code owners:

• pkg/translator/prometheusremotewrite: @Aneurysm9 @kovrus

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[krajorama]

I've started to work on this. I will not introduce configuration to select the cutoff for downscaling (8), but I'll keep the code generic that it can be introduced later as needed.

[kovrus]

@krajorama thanks! I've assigned this issue to you.