Grafana loki logs showing up as `unknown_service`

Grafana Loki
, ,
1

Hello Grafana Community,

Pushing app logs from local grafana alloy to Grafana cloud.
Service name of the logs shows up as unknown_service in the logs ui.
How to fix this?

Thank you.

1 Like
2

I had this same problem. at first i used

  stage.labels {
    values = {
      job  = "my_job_name",
      service_name = "my_job_name",
    }

from this answer but it did not work for me. I then tried

    stage.static_labels {
      values = {
        job  = "nginx",
        service_name = "nginx",
    }

this seemed to do the trick, i was able to see nginx in grafana cloud explorer for loki logs.
Here is the full config

otelcol.auth.basic "grafana_auth" {
  username = env("BASIC_AUTH_GRAFANA_USERNAME")
  password = env("BASIC_AUTH_GRAFANA_PASSWORD")
}

local.file_match "nginx_logs" {
  path_targets = [
    {__path__ = "/var/log/nginx/*.log"},
  ]
}

loki.source.file "nginx_logfiles" {
  targets    = local.file_match.nginx_logs.targets
  forward_to = [loki.process.labels.receiver]
}

loki.process "labels" {
    forward_to =  [loki.write.grafanacloud.receiver]
      
    stage.static_labels {
      values = {
        job  = "nginx",
        service_name = "nginx",
    }
  }
}

loki.write "grafanacloud" {
    max_streams = 10
  endpoint {
    url = "https://logs-prod3.grafana.net/loki/api/v1/push"
    batch_wait = "5s"
    batch_size = "1MiB"
    min_backoff_period = "1s"
    basic_auth {
      username = "xxxxxx"
      password = env("BASIC_AUTH_GRAFANA_LOKI")
    }
  }
}
1 Like
3

Awesome. Thank you very much for this solution

1 Like