Jena Fuseki Exporter

Overview

The application exports information about the number of graphs from Apache Jena Fuseki to Prometheus. It was created forfor performance monitoring of the database.

sequenceDiagram
    actor User
    participant Grafana
    participant Prometheus
    participant Jena Fuseki Exporter
    participant Jena Fuseki Exporter
    loop Every 10 minutes
        Prometheus->>+Jena Fuseki Exporter: GET /metrics
        Jena Fuseki Exporter->>+Jena Fuseki: SPARQL query
        Jena Fuseki-->>-Jena Fuseki Exporter: Graphs count
        Jena Fuseki Exporter-->>-Prometheus: Graphs count
        Prometheus->>Prometheus: Save
    end
    User->>+Grafana: Show dashboard
    Grafana->>+Prometheus: PromQL query
    Prometheus-->>-Grafana: Graphs count timeseries
    Grafana-->>-User: Dashboard

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Development

How to start locally

1. ray sync
2. . .venv/bin/activate
3. fastapi dev src/jena_fuseki_exporter/main.py

The repo contains a GitHub action. It builds and publishes a container image, and publishes a Helm chart. To trigger it, set a Git tag.