metrics name changes

[rootofevils]

Component(s)

No response

Describe the issue you're reporting

I'm using promtheus jmx_exporter to monitor jmx
my otelcol config

extensions:
  health_check:

receivers:
  prometheus/jmx:
    config:
      scrape_configs:
        - job_name: 'jmx_exporter'
          scrape_interval: 15s
          static_configs:
            - targets: ["127.0.0.1:12345"]
              labels:
                metric_type: "jmx"

exporters:
  prometheus/01:
    endpoint: "0.0.0.0:8091"
    const_labels:
      host_name: "r02"

service:
  pipelines:
    metrics/01:
      receivers: [prometheus/jmx]
      exporters: [prometheus/01]

When I visit http://127.0.0.1:12345/metrics (jvm_exporter), I can find the metrics named jvm_info

But when I visit http://127.0.0.1:8091/metrics, what I find is the metrics named jvm.

I suspect otelcol processed the data, although I did not configure processors

By the way, the version of my otelcol is
otelcol-contrib version 0.91.0

[github-actions]

Pinging code owners for receiver/jmx: @rmfitzpatrick. See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

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

[Frapschen]

I can reproduce this. I add a bug label and wait for the code owner to deep look into it.

[github-actions]

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

[cmergenthaler]

I think this is expected due to normalization of prometheus metrics. If you want to disable the behaviour and keep metric names as they are, try setting add_metric_suffixes = false

[dashpole]

I wonder if the endpoint is scraped with OpenMetrics, rather than prometheus?

Can you try curl -H 'Accept: application/openmetrics-text' localhost:12345/metrics?

It is possible the metric name is just "jvm" in OpenMetrics.

If that is the case, you can update the prometheus config to only use the prometheus format:

global:
    scrape_protocols: [ PrometheusText0.0.4 ]

[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:

• receiver/prometheus: @Aneurysm9 @dashpole
• exporter/prometheus: @Aneurysm9

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

[github-actions]

This issue has been closed as inactive because it has been stale for 120 days with no activity.