[DOC] Tail-based sampling not working

[lovesharepc]

I reference this doc https://grafana.com/docs/tempo/latest/configuration/grafana-agent/tail-based-sampling/

1. doc is old
   current config need like this

      tail_sampling:
        decision_wait: 10s
        num_traces: 100
        expected_new_traces_per_sec: 10
        policies:
          [
            {
              name: errors-policy,
              type: status_code,
              status_code: { status_codes: [ERROR] },
            }
          ]

2. don't work
   I use otel/opentelemetry-collector-contrib:0.76.1
   with same tail_sampling config
   sampling can work
   use grafana agent is not
   grafana agent version

root@grafana-agent:/# grafana-agent --version 
agent, version main-d9462f2 (branch: main, revision: d9462f27)
  build user:       root@buildkitsandbox
  build date:       2023-05-05T22:32:14Z
  go version:       go1.20.3
  platform:         linux/amd64
  tags:             netgo,builtinassets,promtail_journal_enabled

[rfratto]

Hi, thanks for reporting. The page you've linked is under Tempo, so I'm moving this to the Tempo repository.

[joe-elliott]

It will be very difficult for us to keep up with Agent docs going forward. I think we should mention the Agent in Tempo docs as a first class telemetry pipeline to be used with Grafana Cloud Traces/OSS Tempo and then link to their docs.

wdyt @knylander-grafana ?

[lovesharepc]

thank for reply
actually, I hope is grafana agent can update include's opentelemetry collector to keep feature work
doc can just link to official doc

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[knylander-grafana]

Doc PR - #3167

@joe-elliott There are two trains of thought on the Agent doc that's in Tempo. We can move it to the Agent doc area with flags for Tempo, which then means Tempo users have to go to a different doc set. We can keep it in Tempo, or single source it and share it between Agent and Tempo.