Export data from MongoDB as prometheus metrics.

This is still in development and a proof of concept for now. It has never been tested on a real application database, just test datasets.

You write an aggregation pipeline, that returns data in the form of

{
    "labels": {
        "labelKey": "labelValue",
        "anotherKey": "anotherValue"
    },
    "value": 1234
}

MongoDB Query Exporter takes these results and exports every result of the pipeline as a prometheus metric.

The pipeline needs to be placed in a JSON file with the following properties.

You can generate nice dashboards in Grafana, based on your data in Prometheus. Also alerting on stuff happening in the database, but I think this is better handled by the application. It is however an option with this exporter.

• Pipeline validation
• Testing this with real application databases
• Support for other metric types than gauges