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monitoring/grafana/datasources.yml

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+# Grafana datasource provisioning — Prometheus (default), Loki, Tempo, wired for
+# trace <-> log <-> metric correlation. Copied to
+# /etc/grafana/provisioning/datasources/ by install.sh.
+apiVersion: 1
+
+datasources:
+  - name: Prometheus
+    type: prometheus
+    uid: prometheus
+    access: proxy
+    url: http://localhost:9090
+    isDefault: true
+    jsonData:
+      httpMethod: POST
+
+  - name: Loki
+    type: loki
+    uid: loki
+    access: proxy
+    url: http://localhost:3100
+    jsonData:
+      # Turn a trace_id found on a log line into a clickable jump to the trace in Tempo.
+      # OTLP logs carry the id as structured metadata `trace_id`; adjust the regex if your
+      # app instrumentation emits it differently.
+      derivedFields:
+        - name: TraceID
+          matcherType: label
+          matcherRegex: trace_id
+          datasourceUid: tempo
+          url: "${__value.raw}"
+          urlDisplayLabel: "View trace"
+
+  - name: Tempo
+    type: tempo
+    uid: tempo
+    access: proxy
+    url: http://localhost:3200
+    jsonData:
+      # Span -> related logs in Loki.
+      tracesToLogsV2:
+        datasourceUid: loki
+        spanStartTimeShift: "-1h"
+        spanEndTimeShift: "1h"
+        filterByTraceID: true
+        filterBySpanID: false
+      # Span -> RED metrics in Prometheus (from Tempo's metrics_generator).
+      tracesToMetrics:
+        datasourceUid: prometheus
+      # Service graph + node graph from the generator's service-graph metrics.
+      serviceMap:
+        datasourceUid: prometheus
+      nodeGraph:
+        enabled: true