When the metrics endpoint is called, Microservices Runtime gathers metrics and returns the data in a Prometheus format. Prometheus is an open source monitoring and alerting toolkit which is frequently used for monitoring containers.

Microservices Runtime returns server-level metrics, service-level metrics, and JVM metrics. Most of the metrics returned by Microservices Runtime are gauge metrics, one of the core metric types. The following sections identify the server, service-level, and JVM metrics gathered and returned by Microservices Runtime.

Microservices Runtime can also gather and return metrics for layered products. For a list and description of metrics returned by layered products, consult the documentation for those products.