Java Agent for Cassandra Metrics Export to Prometheus

At Nabto we are using many technologies in our platform, one of them is Cassandra. We are monitoring Cassandra with the following setup setup: Cassandra + Prometheus JMX Exporter -> Prometheus -> Grafana. This setup has a component which does not meet our requirements for a production setup: The Prometheus JMX Exporter uses too much memory and CPU for the simple task it has to do.

To mitigate this problem we have created a new Java Agent which directly exports the Dropwizard metrics from the Cassandra core through the Prometheus Dropwizard Exporter and serves the metrics through a resource limited Jetty HTTP server.

The code and documentation can be found on GitHub

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