Grafana Alloy config used in blog post https://rudimartinsen.com/2025/07/27/otel-instrumenting-app/

config.alloy

logging {
  level = "info"
  write_to = [loki.write.default.receiver]
}

livedebugging {
  enabled = true
}

prometheus.exporter.self "default" {
}

prometheus.scrape "metamonitoring" {
  targets    = prometheus.exporter.self.default.targets
  forward_to = [prometheus.remote_write.default.receiver]
}

prometheus.remote_write "default" {
  endpoint {
    url = "<PROMETHEUS_SERVER>/api/v1/write"
  }
}

loki.write "default" {
  endpoint {
    url = "<LOKI_SERVER>/loki/api/v1/push"
  }
}

otelcol.processor.batch "default" {
  output {
    metrics = [otelcol.exporter.prometheus.default.input]
  }
}

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

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

  output {
    metrics = [otelcol.processor.batch.default.input]
    traces = [otelcol.exporter.otlp.tempo.input]
    logs = [otelcol.processor.attributes.default.input]
  }
}

otelcol.exporter.otlp "tempo" {
  client {
    endpoint = "<TEMPO_SERVER>:4317"
    tls {
      insecure = true
      insecure_skip_verify = true
    }
  }
}

otelcol.processor.attributes "default" {
  action {
    key = "loki.attribute.labels"
    action = "insert"
    value = "event.domain, event.name"
  }

  action {
    key = "loki.resource.labels"
    action = "insert"
    value = "service.name, service.namespace"
  }

  output {
    logs = [otelcol.exporter.loki.default.input]
  }
}

otelcol.exporter.loki "default" {
  forward_to = [loki.write.default.receiver]
}