Haproxyreceiver HTTP not supported

[akumetsu183]

Component(s)

receiver/haproxy

What happened?

Description

HAProxy receiver readme mentions support for HTTP, but it does not work for me.

Seems to me like the functionality support is planned but not implemented yet.
If that is the case, I would be ok with that state being mentioned in the readme.

Steps to Reproduce

1. Run v81 collector docker image
2. Run haproxy:2.8.1 docker image (and expose HTTP stats endpoint by configuring haproxy.cfg)

frontend stats
        mode http
        bind *:8404
        stats enable
        stats uri /stats

3. Try to scrape the HTTP endpoint with the receiver. (test in browser that it really is exposed)

receivers:
  haproxy:
    endpoint: "http://{haproxy-container-ip}:8408/stats"
    collection_interval: 30s

Expected Result

HTTP endpoint scraped as mentioned in readme.
Or readme saying it does not work for HTTP.

Actual Result

HTTP endpoint not scraped, looks like it uses the same code path as for the socket, resulting in a fail.

Collector version

0.81.0

Environment information

Environment

Collector docker image: otel/opentelemetry-collector-contrib:0.81.0

HaProxy Dockerfile

FROM haproxy:2.8.1 as updated
COPY haproxy.cfg /usr/local/etc/haproxy/haproxy.cfg

I just added this to haproxy.cfg to enable stats on 8404/stats

frontend stats
        mode http
        bind *:8404
        stats enable
        stats uri /stats

That exposed this.

OpenTelemetry Collector configuration

receivers:
  haproxy:
    endpoint: "http://{haproxy-container-ip}:8404/stats"
    collection_interval: 30s

exporters:
  otlp:
    endpoint: $OTEL_ENDPOINT
    tls:
      insecure: false
    headers: {"Authorization": $OTEL_TOKEN}

service:
  pipelines:
    metrics:
      receivers: [haproxy]
      exporters: [otlp]

Log output

2023-07-24 09:22:00 2023-07-24T07:22:00.979Z    error   scraperhelper/scrapercontroller.go:213  Error scraping metrics  {"kind": "receiver", "name": "haproxy", "data_type": "metrics", "error": "dial unix http://localhost:8404/stats: connect: no such file or directory", "scraper": ""}
2023-07-24 09:22:00 go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).scrapeMetricsAndReport
2023-07-24 09:22:00     go.opentelemetry.io/collector/[email protected]/scraperhelper/scrapercontroller.go:213
2023-07-24 09:22:00 go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).startScraping.func1
2023-07-24 09:22:00     go.opentelemetry.io/collector/[email protected]/scraperhelper/scrapercontroller.go:192

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/haproxy: @atoulme @MovieStoreGuy

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