This example demonstrates how to use the OpenTelemetry SDK to instrument a simple application using Prometheus as the metric exporter and expose the metrics via HTTP.

These are collected by a Prometheus instance which is configured to pull these metrics via HTTP.

• Java 1.7
• Docker 19.03

../gradlew fatJar

Start Prometheus instance with a configuration that sets up a HTTP collection job for 127.0.0.1:19090

See prometheus.yml

docker run --network="host" --rm -it \
    --name prometheus \
    -v $(pwd)/prometheus.yml:/etc/prometheus/prometheus.yml \
    prom/prometheus 

java -cp build/libs/opentelemetry-examples-prometheus-all-0.1.0-SNAPSHOT.jar io.opentelemetry.example.PrometheusExample 19090

Navigate to:

http://localhost:9090/graph?g0.range_input=15m&g0.expr=incoming_messages&g0.tab=0