Metrics

Hermes Frontend and Consumers use Dropwizard Metrics library to gather and publish metrics to Metric Store.

If you would like to preview or debug metrics, set {modulePrefix}.metrics.consoleReporterEnabled to true, so they will be printed to stdout.

Graphite

By default, Hermes includes Graphite reporter, which can be configured using following options:

Option	Description	Default value
{modulePrefix}.metrics.graphiteReporterEnabled	enable Graphite reporter	false
{modulePrefix}.graphite.host	Graphite host	localhost
{modulePrefix}.graphite.port	Graphite port	2003
{modulePrefix}.graphite.prefix	prefix for all metrics	stats.tech.hermes
{modulePrefix}.metrics.reportPeriod	how often to report metrics	20s

In order to be able to access basic metrics via Management API, it needs to be configured to reach Graphite API:

Option	Description	Default value
metrics.graphiteHttpUri	URI to Graphite HTTP API	http://localhost:80
metrics.prefix	prefix for all metrics	stats.tech.hermes

Custom

You can register any custom reporter that is compatible with Dropwizard MetricRegistry.

For the Consumers and Frontend modules register the reporter as a bean, for example:

@Configuration
public class CustomHermesConsumersConfiguration {

    @Bean
    @Primary
    public MetricRegistry myMetricRegistry(MetricRegistry metricRegistry) {
        return new MyMetricsReporter(metricRegistry);
    }
}