Handler function to expose Datomic's metrics via JMX

Datomic is a powerful database system that provides efficient and scalable solutions for data management. One important aspect of managing a Datomic system is monitoring its performance and metrics. To address this need, Gabriel Luque Di Donna has developed a handler function called datomic-jmx-metrics that exposes Datomic's metrics via JMX.

With the datomic-jmx-metrics library, developers can easily monitor their Datomic system using tools like JConsole or VisualVM during development. In production environments, tools like Prometheus and Grafana can be used to monitor the system using JMX exporter.

To use this library, developers need to add the datomic-jmx-metrics JAR to the classpath of the transactor or peer server. The JAR can be downloaded from the official Datomic website and added to the lib directory of the Datomic installation. It is important to note that the JAR is a "thin" JAR and does not include any dependencies, as the only dependency required is "org.clojure/java.jmx," which is already included in Datomic.

Additionally, developers need to expose the JMX port of the transactor or peer server to connect to it with a JMX client. However, it is worth mentioning that exposing the JMX port in production environments is not recommended.

For a practical example of how to use the datomic-jmx-metrics library to monitor a Datomic system using Prometheus and Grafana, developers can refer to the "monitoring" branch of the datomic-compose project.

Overall, the datomic-jmx-metrics library provides a convenient solution for developers to monitor the performance and metrics of their Datomic system, both during development and in production environments.