chore: add Grafana and Prometheus setup for observability with Docker Compose

Author: thomasduft

.devcontainer/devcontainer.json

@@ -6,6 +6,7 @@
   "image": "mcr.microsoft.com/devcontainers/dotnet:1-9.0-bookworm",
   // Features to add to the dev container. More info: https://containers.dev/features.
   "features": {
+    "ghcr.io/devcontainers/features/docker-in-docker:1": {},
     "ghcr.io/devcontainers/features/desktop-lite:1": {}
   },
   "customizations": {
@@ -34,4 +35,4 @@
   // "customizations": {},
   // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
   // "remoteUser": "root"
-}
+}

samples/Observability/README.md

@@ -0,0 +1,27 @@
+# TestR Observability
+
+Idea is to have a local Grafana instance that visualizes OpenTelemetry metrics from the Test Runs generated by the TestR tool. Like that we can visualize the results of the tests in Grafana and setup alerts based on the results.
+
+## Big Picture
+
+```mermaid
+graph LR
+    TestR --> Prometheus
+    Prometheus --> Grafana
+```
+
+## Services
+
+| Service       | URL                   |
+| ------------- | --------------------- |
+| Grafana       | http://localhost:3000 |
+| Prometheus    | http://localhost:9090 |
+
+Grafana Default credentials:
+- User: admin
+- Password: grafana
+
+## Resources
+
+- [OpenTelemetry .NET](https://opentelemetry.io/docs/languages/dotnet/getting-started/)
+- [Use OpenTelemetry with Prometheus, Grafana, and Jaeger](https://learn.microsoft.com/en-us/dotnet/core/diagnostics/observability-prgrja-example)

samples/Observability/docker-compose.yaml

@@ -0,0 +1,27 @@
+services:
+  grafana:
+    image: grafana/grafana
+    container_name: grafana
+    ports:
+      - 3000:3000
+    restart: unless-stopped
+    environment:
+      - GF_SECURITY_ADMIN_USER=admin
+      - GF_SECURITY_ADMIN_PASSWORD=grafana
+    volumes:
+      - ./grafana:/etc/grafana/provisioning/datasources
+
+  prometheus:
+    image: prom/prometheus
+    container_name: prometheus
+    command:
+      - '--config.file=/etc/prometheus/prometheus.yml'
+    ports:
+      - 9090:9090
+    restart: unless-stopped
+    volumes:
+      - ./prometheus:/etc/prometheus
+      - prom_data:/prometheus
+
+volumes:
+  prom_data:

samples/Observability/grafana/datasource.yml

@@ -0,0 +1,9 @@
+apiVersion: 1
+
+datasources:
+- name: Prometheus
+  type: prometheus
+  url: http://prometheus:9090
+  isDefault: true
+  access: proxy
+  editable: true

samples/Observability/prometheus/prometheus.yml

@@ -0,0 +1,21 @@
+global:
+  scrape_interval: 15s
+  scrape_timeout: 10s
+  evaluation_interval: 15s
+alerting:
+  alertmanagers:
+  - static_configs:
+    - targets: []
+    scheme: http
+    timeout: 10s
+    api_version: v2
+scrape_configs:
+- job_name: prometheus
+  honor_timestamps: true
+  scrape_interval: 15s
+  scrape_timeout: 10s
+  metrics_path: /metrics
+  scheme: http
+  static_configs:
+  - targets:
+    - localhost:9090