Example of the Prometheus Java client library's support for pushing metrics in OpenTelemetry format.
This repository is a simple example that shows how to push Prometheus metrics to a Prometheus server using OTLP.
Clone this repo:
git clone https://github.com/fstab/client_java-otel-example.git
cd ./client_java-otel-example/
Download and run the Prometheus server with the OTLP endpoint enabled:
./run-prometheus.sh
Compile and run the Java example:
./mvnw package
java -jar target/client_java-otel-example.jar
The example program exposes metrics two times
- It exposed metrics in Promethus text format on http://localhost:9000/metrics
- It pushes metrics to the Prometheus server's OpenTelemetry endpoint http://localhost:9090/api/v1/otlp
The Prometheus server is not configured to scrape the Prometheus endpoint. The Prometheus endpoint is there so you can quickly check with your browser which metrics should be available. Access http://localhost:9000/metrics to see which metrics should be available, and then run a few PromQL queries on http://localhost:9090 to see if these metrics have actually been pushed via OTLP.