Prometheus

This document contains information on how to expose prometheus metrics on your sapi-nt application.

First step is to add the required dependencies including the spring boot actuator and the prometheus registry:

<!-- Spring Boot Actuator -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

The next step is to enable the metrics using the application properties:

management.endpoints.web.exposure.include=prometheus
management.metrics.export.prometheus.enabled=true

The above properties will enable prometheus exposing all default metrics. To find out more about spring boot actuator and other configuration properties checkout the official documentation.

This also enables custom sapi-nt metrics.

Metric	Type	Description
`request_seconds`	Histogram	The time taken to perform each request in seconds.
`fuseki_connection_count`	Counter	Counts successful and unsuccessful connections to fuseki (state tag determines the state of connection).