Grafana Alloy OpenTelemetry Collector

helm install alloy grafana/alloy \
  --namespace monitoring --create-namespace

// Scrape Kubernetes pods for Prometheus metrics
prometheus.scrape "pods" {
  targets    = discovery.kubernetes.pods.targets
  forward_to = [prometheus.remote_write.mimir.receiver]
}

// Discover Kubernetes pods
discovery.kubernetes "pods" {
  role = "pod"
}

// Send metrics to Mimir/Prometheus
prometheus.remote_write "mimir" {
  endpoint {
    url = "http://mimir.monitoring:9009/api/v1/push"
  }
}

prometheus.scrape "nodes" {
  targets = [{
    __address__ = "localhost:9100",
    job         = "node-exporter",
  }]
  scrape_interval = "15s"
  forward_to      = [prometheus.remote_write.mimir.receiver]
}

// Discover pod logs
loki.source.kubernetes "pods" {
  targets    = discovery.kubernetes.pods.targets
  forward_to = [loki.process.pipeline.receiver]
}

// Process logs (parse JSON, add labels)
loki.process "pipeline" {
  stage.json {
    expressions = {
      level   = "level",
      message = "msg",
    }
  }
  stage.labels {
    values = { level = "" }
  }
  forward_to = [loki.write.default.receiver]
}

// Send to Loki
loki.write "default" {
  endpoint {
    url = "http://loki.monitoring:3100/loki/api/v1/push"
  }
}

// Receive OTLP traces
otelcol.receiver.otlp "default" {
  grpc {
    endpoint = "0.0.0.0:4317"
  }
  http {
    endpoint = "0.0.0.0:4318"
  }
  output {
    traces = [otelcol.exporter.otlp.tempo.input]
  }
}

// Send to Tempo
otelcol.exporter.otlp "tempo" {
  client {
    endpoint = "tempo.monitoring:4317"
  }
}

// === METRICS ===
discovery.kubernetes "pods" { role = "pod" }

prometheus.scrape "pods" {
  targets    = discovery.kubernetes.pods.targets
  forward_to = [prometheus.remote_write.mimir.receiver]
}

prometheus.remote_write "mimir" {
  endpoint { url = "http://mimir:9009/api/v1/push" }
}

// === LOGS ===
loki.source.kubernetes "pods" {
  targets    = discovery.kubernetes.pods.targets
  forward_to = [loki.write.loki.receiver]
}

loki.write "loki" {
  endpoint { url = "http://loki:3100/loki/api/v1/push" }
}

// === TRACES ===
otelcol.receiver.otlp "default" {
  grpc { endpoint = "0.0.0.0:4317" }
  output { traces = [otelcol.exporter.otlp.tempo.input] }
}

otelcol.exporter.otlp "tempo" {
  client { endpoint = "tempo:4317" }
}

// Auto-instrument Java applications
beyla.ebpf "auto" {
  open_port = "8080"
  output {
    traces = [otelcol.exporter.otlp.tempo.input]
  }
}