[prometheusexporter] Expose native histograms about opentelemetry-collector-contrib HOT 4 OPEN

Pinging code owners:

• exporter/prometheus: @Aneurysm9

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

from opentelemetry-collector-contrib.

Hi, I tried it with the following config, and the native histograms are exposed just like they are exposed by my app:

receivers:
    prometheus:
      config:
        scrape_configs:
          - job_name: 'otel-collector'
            scrape_interval: 5s
            static_configs:
              - targets: ['localhost:9001']

exporters:
  prometheus:
    endpoint: "localhost:9010"
    const_labels:
      test_name: v1

service:
  pipelines:
    metrics:
      receivers: [prometheus]
      exporters: [prometheus]
  telemetry:
    logs:
      level: debug

Native histogram metrics exposed by my app:
golang_native_histogram_bucket{address="0.0.0.0",port="9001",le="+Inf"} 1523
golang_native_histogram_sum{address="0.0.0.0",port="9001"} 773369.1551833635
golang_native_histogram_count{address="0.0.0.0",port="9001"} 1523

Native histogram metrics exposed by the prometheus exporter:
golang_native_histogram_bucket{address="0.0.0.0",instance="localhost:9001",job="otel-collector",port="9001",test_name="v1",le="+Inf"} 1284
golang_native_histogram_sum{address="0.0.0.0",instance="localhost:9001",job="otel-collector",port="9001",test_name="v1"} 656156.1718255163
golang_native_histogram_count{address="0.0.0.0",instance="localhost:9001",job="otel-collector",port="9001",test_name="v1"} 1284

Could you share your full setup?

from opentelemetry-collector-contrib.

Are you sure these are native histograms? They look like regular ones to me. The required options are seemingly missing from your receiver config: https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/receiver/prometheusreceiver/README.md#prometheus-native-histograms, so my guess is that you're falling back to the legacy ones here.

EDIT: I added them to the original post, so it's easier to reproduce.

from opentelemetry-collector-contrib.

Ah you are right, I was missing the scape_protocols, I can reproduce it now, thanks :)

from opentelemetry-collector-contrib.