This example is built as part of the client_java project.

./mvnw package

The build creates a JAR file with the example application in ./examples/example-exporter-httpserver/target/.

java -jar ./examples/example-exporter-httpserver/target/example-exporter-httpserver.jar

Accessing http://localhost:9400/metrics with a Web browser should yield an example of a counter metric.

# HELP uptime_seconds_total total number of seconds since this application was started
# TYPE uptime_seconds_total counter
uptime_seconds_total 301.0

The exporter supports a debug URL parameter to quickly view other formats in your Web browser:

• http://localhost:9400/metrics?debug=text: Prometheus text format, same as without the debug option.
• http://localhost:9400/metrics?debug=openmetrics: OpenMetrics text format.
• http://localhost:9400/metrics?debug=prometheus-protobuf: Text representation of the Prometheus protobuf format.