Add support for distributed tracing

code/org.eclipse.scout.docs.snippets/src/main/docker/observability/docker-compose.yml

@@ -1,39 +1,60 @@
+name: scout-observability-infrastructure
 services:
   otel_collector:
     networks:
       - backend
-    image: otel/opentelemetry-collector-contrib:latest
+    image: otel/opentelemetry-collector-contrib:0.115.1
     volumes:
       - "./otel-collector-config.yml:/etc/otelcol/otel-collector-config.yml"
-    command: --config /etc/otelcol/otel-collector-config.yml
+    command:
+      - "--config=/etc/otelcol/otel-collector-config.yml"
     ports:
       - "4318:4318"
     depends_on:
       - prometheus
+      - tempo
+  tempo:
+    networks:
+      - backend
+    image: grafana/tempo:latest
+    volumes:
+      - "./tempo.yml:/etc/tempo.yaml"
+      - "tempo-data:/var/tempo"
+    command:
+      - "-config.file=/etc/tempo.yaml"
+    ports:
+      - "3200:3200"  # tempo rest api
+      - "9095:9095"  # tempo grpc
+      - "4327:4327"  # otlp grpc
+      - "4328:4328"  # otlp http
   prometheus:
     networks:
       - backend
-    image: prom/prometheus:latest
+    image: prom/prometheus:v3.0.1
     command:
       - "--storage.tsdb.retention.time=15d"
       - "--config.file=/etc/prometheus/prometheus.yml"
       - "--web.enable-remote-write-receiver"
+      - "--enable-feature=exemplar-storage"
+      - "--enable-feature=native-histograms"
     volumes:
       - "./prometheus.yml:/etc/prometheus/prometheus.yml"
     ports:
       - "9090:9090"
   grafana:
     networks:
       - backend
-    image: grafana/grafana-oss:10.0.3
+    image: grafana/grafana-oss:11.4.0
     volumes:
       - "./grafana-datasources:/etc/grafana/provisioning/datasources"
-      - grafana-data:/var/lib/grafana
+      - "grafana-data:/var/lib/grafana"
     ports:
       - "3000:3000"
     depends_on:
       - prometheus
+      - tempo
 volumes:
   grafana-data: { }
+  tempo-data: { }
 networks:
   backend: { }

code/org.eclipse.scout.docs.snippets/src/main/docker/observability/grafana-datasources/ds-prometheus.yml

@@ -1,6 +1,9 @@
+apiVersion: 1
+
 datasources:
   - name: Prometheus
-    access: proxy
     type: prometheus
+    access: proxy
+    uid: prometheus
     url: http://prometheus:9090
     isDefault: true

code/org.eclipse.scout.docs.snippets/src/main/docker/observability/grafana-datasources/ds-tempo.yml

@@ -0,0 +1,15 @@
+apiVersion: 1
+
+datasources:
+  - name: Tempo
+    type: tempo
+    access: proxy
+    uid: tempo
+    url: http://tempo:3200
+    jsonData:
+      serviceMap:
+        datasourceUid: 'prometheus'
+      nodeGraph:
+        enabled: true
+      tracesToMetrics:
+        datasourceUid: 'prometheus'

code/org.eclipse.scout.docs.snippets/src/main/docker/observability/otel-collector-config.yml

@@ -3,13 +3,28 @@ receivers:
     protocols:
       http:
         endpoint: "0.0.0.0:4318"
+processors:
+  batch:
+  memory_limiter:
+    # 75% of maximum memory up to 2G
+    limit_mib: 1536
+    # 25% of limit up to 2G
+    spike_limit_mib: 512
+    check_interval: 5s
 exporters:
-  logging:
+  debug:
+  #    verbosity: detailed
   prometheusremotewrite:
     endpoint: "http://prometheus:9090/api/v1/write"
+  otlphttp:
+    endpoint: "http://tempo:4328"
 service:
   pipelines:
+    traces:
+      receivers: [ otlp ]
+      processors: [ memory_limiter, batch ]
+      exporters: [ debug, otlphttp ]
     metrics:
       receivers: [ otlp ]
       processors: [ ]
-      exporters: [ logging, prometheusremotewrite ]
+      exporters: [ debug, prometheusremotewrite ]

code/org.eclipse.scout.docs.snippets/src/main/docker/observability/tempo.yml

@@ -0,0 +1,58 @@
+# inspired by Grafana Tempo's docker compose setup: https://github.com/grafana/tempo/blob/main/example/docker-compose/local/tempo.yaml
+stream_over_http_enabled: true
+server:
+  http_listen_port: 3200
+  log_level: info
+
+query_frontend:
+  search:
+    duration_slo: 5s
+    throughput_bytes_slo: 1.073741824e+09
+    metadata_slo:
+      duration_slo: 5s
+      throughput_bytes_slo: 1.073741824e+09
+  trace_by_id:
+    duration_slo: 5s
+
+distributor:
+  receivers:
+    otlp:
+      protocols:
+        http:
+          endpoint: 0.0.0.0:4328
+        grpc:
+          endpoint: 0.0.0.0:4327
+
+ingester:
+  max_block_duration: 5m               # cut the headblock when this much time passes. this is being set for demo purposes and should probably be left alone normally
+
+compactor:
+  compaction:
+    block_retention: 192h              # overall Tempo trace retention. set for demo purposes to 8 days
+
+metrics_generator:
+  registry:
+    external_labels:
+      source: tempo
+      cluster: docker-compose
+  storage:
+    path: /var/tempo/generator/wal
+    remote_write:
+      - url: http://prometheus:9090/api/v1/write
+        send_exemplars: true
+  traces_storage:
+    path: /var/tempo/generator/traces
+
+storage:
+  trace:
+    backend: local                     # backend configuration to use
+    wal:
+      path: /var/tempo/wal             # where to store the wal locally
+    local:
+      path: /var/tempo/blocks
+
+overrides:
+  defaults:
+    metrics_generator:
+      processors: [ service-graphs, span-metrics, local-blocks ] # enables metrics generator
+      generate_native_histograms: both