[exporter/prometheus] Support exporting min/max for histogram metrics

[xiepuhuan]

Component(s)

exporter/prometheus

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

I don't pay attention to histogram bucket, but I want to know histogram max/min

Describe the solution you'd like

I don't pay attention to histogram bucket, but I want to know histogram max/min

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• exporter/prometheus: @Aneurysm9

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[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• exporter/prometheus: @Aneurysm9

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• exporter/prometheus: @Aneurysm9 @dashpole @ArthurSens

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[dashpole]

The prometheus histogram data model does not include a min and max, so there isn't a good place for us to put it within the histogram. We could create a new timeseries for the min and max, however, the min and max are known to be basically useless for cumulative histograms. For delta histograms, the min and max are the min and max of the most recent interval, which is helpful for showing spikes over time. For cumulative histograms, the min and max are the min and max for all time. For long-lived (> 1 hour) applications, the min and max rarely change in a meaningful way.

Regardless, this change would need a spec issue and a change to the prometheus specification before we can implement it here: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/compatibility/prometheus_and_openmetrics.md.