add simple OpenTelemetry/Grafana stack

.gitignore

@@ -41,3 +41,5 @@
 
 /node_modules
 /.yarn
+
+/volumes/tempo/data/*

compose.dev.yml

@@ -0,0 +1,29 @@
+services:
+  grafana:
+    image: grafana/grafana:10.4.2
+    ports:
+      - "3001:3000"
+    environment:
+      - GF_AUTH_ANONYMOUS_ENABLED=true
+      - GF_AUTH_ANONYMOUS_ORG_ROLE=Admin
+    volumes:
+      - ./volumes/grafana/grafana.ini:/etc/grafana/grafana.ini
+      - ./volumes/grafana/provisioning:/etc/grafana/provisioning
+
+  tempo:
+    image: grafana/tempo:2.4.1
+    command: [ "-config.file=/etc/tempo.yaml" ]
+    ports:
+      - "3200:3200"   # tempo metrics
+      - "4317:4317"  # otlp http
+    volumes:
+      - ./volumes/tempo/tempo.yml:/etc/tempo.yaml
+      - ./volumes/tempo/data:/tmp/tempo
+
+  otel-collector:
+    image: otel/opentelemetry-collector:0.98.0
+    command: [ "--config=/etc/otelcol-config.yml" ]
+    volumes:
+      - ./volumes/otelcol-config.yml:/etc/otelcol-config.yml
+    ports:
+      - "4318:4318"          # OTLP over HTTP receiver