Metric agent_component_controller_running_components when component fails

[sadovnikov]

What's wrong?

When the loki.source.kubernetes_events component fails to load and exits, the value of the agent_component_controller_running_components metric does not change. All GA components are reported as healthy.

When with the enclosed configuration, the Source:EventSource{Component:,Host:,} component fails to load the loki.source.kubernetes_events reports 6 "healthy" components - the same value as with successfully loaded components. The health_type is always "healthy".

The failure to load the component is reported only by this logline:

Steps to reproduce

The Kubernetes Events source fails to load only occasionally and only in overloaded clusters.
Maybe, to reproduce the problem with a dev version, the informerSyncTimeout can be set to a very low value

System information

No response

Software version

v0.37.2

Configuration

Full `config.river`


    logging {
      level  = "info"
      format = "json"
    }

    otelcol.receiver.otlp "otlp" {
      http {}

      output {
        metrics= [otelcol.exporter.prometheus.prom.input]
      }
    }

    otelcol.exporter.prometheus "prom" {
      forward_to  = [ prometheus.remote_write.default.receiver ]
    }

    prometheus.remote_write "default" {
      endpoint {
        url = "http://prometheus-server.monitoring-system.svc.cluster.local/api/v1/write"
      }
    }

    loki.write "obs" {
      external_labels = { cluster = "staging" }
      endpoint {
        url = "https://loki.platform-staging.internal.xxx.yyy/loki/api/v1/push"
      }
    }

    loki.relabel "drop_instance" {
      forward_to = [loki.write.obs.receiver]
      rule {
        action = "labeldrop"
        regex  = "instance"
      }
    }

    loki.source.kubernetes_events "default" {
      forward_to = [loki.relabel.drop_instance.receiver]
      job_name = "kubernetes_events"
      log_format = "json"
    }

### Logs

_No response_

[github-actions]

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[rfratto]

Hi there 👋

On April 9, 2024, Grafana Labs announced Grafana Alloy, the spirital successor to Grafana Agent and the final form of Grafana Agent flow mode. As a result, Grafana Agent has been deprecated and will only be receiving bug and security fixes until its end-of-life around November 1, 2025.

To make things easier for maintainers, we're in the process of migrating all issues tagged variant/flow to the Grafana Alloy repository to have a single home for tracking issues. This issue is likely something we'll want to address in both Grafana Alloy and Grafana Agent, so just because it's being moved doesn't mean we won't address the issue in Grafana Agent :)