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monitoring/tempo/tempo.yml

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+# Tempo — local-disk trace store. Receives OTLP from Alloy on :4319 (Alloy owns :4317/:4318),
+# and runs the metrics_generator to emit RED + service-graph metrics, remote-written into
+# Prometheus so Grafana can draw request rates and the service map without any app metrics.
+server:
+  http_listen_address: 0.0.0.0
+  http_listen_port: 3200
+  grpc_listen_port: 9095
+  log_level: info
+
+distributor:
+  receivers:
+    otlp:
+      protocols:
+        grpc:
+          endpoint: "0.0.0.0:4319"
+
+ingester:
+  max_block_duration: 5m
+
+compactor:
+  compaction:
+    block_retention: 168h          # 7 days of traces
+
+metrics_generator:
+  registry:
+    external_labels:
+      source: tempo
+  storage:
+    path: /var/lib/tempo/generator/wal
+    remote_write:
+      - url: http://localhost:9090/api/v1/write
+        send_exemplars: true
+  traces_storage:
+    path: /var/lib/tempo/generator/traces
+
+storage:
+  trace:
+    backend: local
+    wal:
+      path: /var/lib/tempo/wal
+    local:
+      path: /var/lib/tempo/blocks
+
+# Turn the generator on for every tenant (single-tenant here).
+overrides:
+  defaults:
+    metrics_generator:
+      processors: [service-graphs, span-metrics]