feat: integrate grafana and prometheus#60
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Dejmenek merged 6 commits intoMay 13, 2026
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Added OpenTelemetry.Exporter.OpenTelemetryProtocol (v1.15.3) to enable exporting telemetry data using the OpenTelemetry Protocol (OTLP). Updated Directory.Packages.props, TournamentAPI.csproj, and packages.lock.json to reflect this addition. This allows integration with observability backends such as Jaeger, Prometheus, or OpenTelemetry Collector.
Added Prometheus and Grafana services to docker-compose.yml for monitoring and visualization. Configured Prometheus with OTLP receiver and persistent storage. Exposed ports 5431 (Prometheus) and 3000 (Grafana). Defined named volumes for data persistence.
Refactor TournamentMetrics to use an UpDownCounter for tracking active tournaments instead of an observable gauge. Remove database polling and update the metric in real-time by calling TournamentOpened() and TournamentClosed() when tournaments are created, updated, or deleted. Inject TournamentMetrics into mutation methods to support this change. This improves accuracy and performance of the active tournaments metric.
Removed TournamentMetrics as a hosted service, keeping only its singleton registration. Replaced the console metrics exporter with an OTLP exporter configured for HTTP Protobuf, sending metrics to http://localhost:5431/api/v1/otlp/v1/metrics.
Added global scrape_interval of 15s in prometheus.yml. Configured a new 'prometheus' job with HTTP scheme, 10s scrape interval, 5s scrape timeout, and static target 'localhost:9090'.
Added a "Running the API" section to the README with detailed steps for starting Prometheus and Grafana via Docker Compose, running the .NET 9 API, and connecting Grafana to Prometheus for metrics visualization. Includes prerequisites and service URLs for easier setup.
Dejmenek
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Summary
Implements OTLP metrics export to Prometheus and visualization with Grafana, refactors tournament metrics tracking, and provides local observability setup and documentation.
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