complete observability stak alloy

docker-compose-alloy/alloy-config.alloy

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+// Grafana Alloy Configuration
+// Sostituisce: Promtail + Node Exporter + OTEL Collector
+
+// ============================================================================
+// LOGGING - Raccolta log dai container Docker (sostituisce Promtail)
+// ============================================================================
+
+// Scopri container Docker con label logging=promtail
+discovery.docker "containers" {
+  host = "unix:///var/run/docker.sock"
+
+  filter {
+    name   = "label"
+    values = ["logging=promtail"]
+  }
+
+  refresh_interval = "5s"
+}
+
+// Scrape log dai container scoperti
+loki.source.docker "containers" {
+  host       = "unix:///var/run/docker.sock"
+  targets    = discovery.docker.containers.targets
+  forward_to = [loki.relabel.docker.receiver]
+}
+
+// Relabeling per aggiungere label ai log
+loki.relabel "docker" {
+  forward_to = [loki.write.default.receiver]
+
+  rule {
+    source_labels = ["__meta_docker_container_name"]
+    regex         = "/(.*)"
+    target_label  = "container"
+  }
+
+  rule {
+    source_labels = ["__meta_docker_container_label_logging_jobname"]
+    target_label  = "job"
+  }
+}
+
+// Scrivi i log a Loki
+loki.write "default" {
+  endpoint {
+    url = "http://loki:3100/loki/api/v1/push"
+  }
+
+  external_labels = {
+    environment = "production",
+    cluster     = "myapp-cluster",
+  }
+}
+
+// ============================================================================
+// METRICS - Metriche sistema host (sostituisce Node Exporter)
+// ============================================================================
+
+// Scraping metriche locali dell'host
+prometheus.exporter.unix "host" {
+  // Raccoglie metriche del sistema operativo
+  set_collectors = [
+    "cpu",
+    "loadavg",
+    "meminfo",
+    "netdev",
+    "diskstats",
+    "filesystem",
+    "uname",
+    "time",
+  ]
+}
+
+// Scrape delle metriche raccolte
+prometheus.scrape "host_metrics" {
+  targets    = prometheus.exporter.unix.host.targets
+  forward_to = [prometheus.remote_write.default.receiver]
+
+  scrape_interval = "10s"
+
+  clustering {
+    enabled = false
+  }
+}
+
+// Scraping self-monitoring di Alloy
+prometheus.scrape "alloy_metrics" {
+  targets = [{
+    __address__ = "localhost:12345",
+  }]
+  forward_to = [prometheus.remote_write.default.receiver]
+
+  scrape_interval = "10s"
+}
+
+// ============================================================================
+// TRACES - Ricezione traces OTLP (sostituisce OTEL Collector)
+// ============================================================================
+
+// Ricevi traces via OTLP gRPC
+otelcol.receiver.otlp "default" {
+  grpc {
+    endpoint = "0.0.0.0:4317"
+  }
+
+  http {
+    endpoint = "0.0.0.0:4318"
+  }
+
+  output {
+    metrics = [otelcol.processor.batch.default.input]
+    logs    = [otelcol.processor.batch.default.input]
+    traces  = [otelcol.processor.batch.default.input]
+  }
+}
+
+// Batch processor per ottimizzare l'invio
+otelcol.processor.batch "default" {
+  timeout              = "10s"
+  send_batch_size      = 10000
+  send_batch_max_size  = 11000
+
+  output {
+    metrics = [otelcol.exporter.prometheus.default.input]
+    traces  = [otelcol.exporter.otlp.tempo.input]
+    logs    = [otelcol.exporter.loki.default.input]
+  }
+}
+
+// Esporta metriche OTLP a Prometheus
+otelcol.exporter.prometheus "default" {
+  forward_to = [prometheus.remote_write.default.receiver]
+}
+
+// Esporta traces a Tempo
+otelcol.exporter.otlp "tempo" {
+  client {
+    endpoint = "tempo:4317"
+    tls {
+      insecure = true
+    }
+  }
+}
+
+// Esporta log OTLP a Loki
+otelcol.exporter.loki "default" {
+  forward_to = [loki.write.default.receiver]
+}
+
+// ============================================================================
+// REMOTE WRITE - Invia metriche a Prometheus
+// ============================================================================
+
+prometheus.remote_write "default" {
+  endpoint {
+    url = "http://prometheus:9090/api/v1/write"
+
+    metadata_config {
+      send_interval = "1m"
+    }
+
+    queue_config {
+      capacity          = 10000
+      max_shards        = 10
+      min_shards        = 1
+      max_samples_per_send = 5000
+    }
+  }
+}