Instructions for collecting Docker metrics using Prometheus from docs is not reproducible

[QazCetelic]

Is this a docs issue?

• My issue is about the documentation content or website

Type of issue

Information is incorrect

Description

I have the same issue as #6028, however the suggested solution did not work for me.

I have used 127.0.0.1 in my docker config as recommended.
/etc/docker/daemon.json:

{
  "metrics-addr": "127.0.0.1:9323",
  "default-address-pools": [
    {
      "base" : "172.16.0.0/12",
      "size" : 24
    }
  ]
}

And I'm using host.docker.internal in my Prometheus config as suggested in the docs.

global:
  scrape_interval: 15s
  evaluation_interval: 15s

scrape_configs:
  - job_name: prometheus
    static_configs:
      - targets: ["prometheus:9090"]

  - job_name: docker
    static_configs:
      - targets: ["host.docker.internal:9323"]

However, I'm unable to reach the port from within the Prometheus container even though I can reach it outside using curl http://127.0.0.1:9323/metrics.

Location

https://docs.docker.com/engine/daemon/prometheus/

Suggestion

Update the tutorial page in the documentation

[QazCetelic]

For anyone wondering how to get it to work, I just set it to 0.0.0.0.
It does of course expose the metrics to other devices on the network, but as the docs say: consider your threat model.