haproxy receiver gives error "record on line 21: wrong number of fields" in socket mode

[ubcharron]

Component(s)

receiver/haproxy

What happened?

Description

When using the haproxy receiver to collect metrics from an haproxy via unix socket, the otel collector spits the following error message:

2024-04-10T01:19:24.122Z        error   scraperhelper/scrapercontroller.go:197  Error scraping metrics  {"kind": "receiver", "name": "haproxy", "data_type": "metrics", "error": "record on line 21: wrong number of fields", "scraper": "haproxy"}

I believe it is because the command sent is show stats, whereas according to the haproxy doc it should be "show stat" (singular).

When I manually use "show stats", haproxy gives an error message:

$ echo 'show stats' | socat /run/haproxy/admin.sock stdio
Unknown command. Please enter one of the following commands only :
  help           : this message
  prompt         : toggle interactive mode with prompt
  quit           : disconnect
...

but "show stat" works:

$ echo 'show stat' | socat /run/haproxy/admin.sock stdio
# pxname,svname,qcur,qmax,scur,smax,slim,stot,bin,bout,dreq,dresp,ereq,econ,eresp,wretr,wredis,status,weight,act,bck,chkfail,chkdown,lastchg,downtime,qlimit,pid,iid,sid,throttle,lbtot,tracked,type,rate,rate_lim,rate_max,check_status,check_code,check_duration,hrsp_1xx,hrsp_2xx,hrsp_3xx,hrsp_4xx,hrsp_5xx,hrsp_other,hanafail,req_rate,req_rate_max,req_tot,cli_abrt,srv_abrt,comp_in,comp_out,comp_byp,comp_rsp,lastsess,last_chk,last_agt,qtime,ctime,rtime,ttime,agent_status,agent_code,agent_duration,check_desc,agent_desc,check_rise,check_fall,check_health,agent_rise,agent_fall,agent_health,addr,cookie,mode,algo,conn_rate,conn_rate_max,conn_tot,intercepted,dcon,dses,wrew,connect,reuse,cache_lookups,cache_hits,srv_icur,src_ilim,qtime_max,ctime_max,rtime_max,ttime_max,

Steps to Reproduce

Setup a basic haproxy

global
  stats socket /run/haproxy/admin.sock mode 660

Configure a basic otel collector with haproxy receiver:

receivers:
  haproxy:
    endpoint: /run/haproxy/admin.sock
    collection_interval: 10s

exporters:
  debug:
    verbosity: detailed

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

Expected Result

Successfully collect stats from haproxy.

Actual Result

I get the following error from otel collector with both haproxy 1.8.8 and 2.0.33:

2024-04-10T01:22:15.149Z        error   scraperhelper/scrapercontroller.go:197  Error scraping metrics  {"kind": "receiver", "name": "haproxy", "data_type": "metrics", "error": "record on line 21: wrong number of fields", "scraper": "haproxy"}

Collector version

0.97.0

Environment information

Environment

Ubuntu 20.04.6 LTS
haproxy 2.0.33-0ubuntu0.1

OpenTelemetry Collector configuration

receivers:
  haproxy:
    endpoint: /run/haproxy/admin.sock
    collection_interval: 10s

exporters:
  debug:
    verbosity: detailed

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

Log output

2024-04-10T01:22:15.149Z        error   scraperhelper/scrapercontroller.go:197  Error scraping metrics  {"kind": "receiver", "name": "haproxy", "data_type": "metrics", "error": "record on line 21: wrong number of fields", "scraper": "haproxy"}
go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).scrapeMetricsAndReport
        go.opentelemetry.io/collector/receiver@v0.97.0/scraperhelper/scrapercontroller.go:197
go.opentelemetry.io/collector/receiver/scraperhelper.(*controller).startScraping.func1
        go.opentelemetry.io/collector/receiver@v0.97.0/scraperhelper/scrapercontroller.go:169
2024-04-10T01:22:15.150Z        info    MetricsExporter {"kind": "exporter", "data_type": "metrics", "name": "debug", "resource metrics": 0, "metrics": 0, "data points": 0}
2024-04-10T01:22:15.150Z        info            {"kind": "exporter", "data_type": "metrics", "name": "debug"}

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/haproxy: @atoulme @MovieStoreGuy

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