[mdatagen] Telemetry metrics add support for exponential histogram

[1pkg]

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Component(s)

cmd/mdatagen

Describe the issue you're reporting

When instrumenting collector components with mdatagen, there is often a need to use histograms to capture metrics such as latency. Currently, mdatagen only supports creating histograms that are collected with the default AggregationExplicitBucketHistogram aggregation. For generic components such as kafkareceiver, kafkaexporter, etc. which may be used with various vendors, it is not very practical to define universal explicit buckets in advance.

It would be very helpful to provide a way to create histograms that are collected with the AggregationBase2ExponentialHistogram aggregation in mdatagen. This would simplify instrumentation for the described use case by providing auto buckets configuration.

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Pinging code owners:

• cmd/mdatagen: @dmitryax

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[1pkg]

I'd like to try to implement this change to mdatagen. It seems this can be potentially achieved by wrapping the meter provider internally and leveraging custom View overrides.