Question: how to scrape the prometheus reporter in v2.0.0?

[dcastro]

To manually scrape the reporter in v1, you can do something like this:

val reporter = new PrometheusReporter()
Kamon.addReporter(new PrometheusReporter())

val data = reporter.scrapeData()

But in v2, Kamon.addReporter doesn't exist anymore. What's the correct way of doing this in v2?

[jneumaier]

I used the following workaround in Java to register my own PrometheusReporter instance (serving the scrape data on another HTTP server with TLS support):

Kamon.init(config);
Kamon._moduleRegistry().register("Prometheus Reporter", scala.Option.apply(null), prometheusReporter);

If this does not work a reporter with the exact same name "Prometheus Reporter" might have already been registered. In this case the ModuleRegistry might skip registration with a warning ("Cannot register module [$name], a module with that name already exists.")

[ane]

You can probably get away with by disabling the built-in module by setting kamon.modules.prometheus-reporter.enabled to false and then starting the reporter manually:

val reporter = new PrometheusReporter
Kamon.registerModule("prometheus", reporter)
// ...
val data = reporter.scrapeData()

[dcastro]

Thanks @ane! Replacing addReporter with registerModule worked!