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Passing through to Dropwizard’s Console Reporter

This guide shows how to plug in less commonly used Dropwizard Reporter implementations — in this case, the ConsoleReporter.

	@Bean
	public MetricRegistry dropwizardRegistry() {
		return new MetricRegistry();
	}

	@Bean
	public ConsoleReporter consoleReporter(MetricRegistry dropwizardRegistry) {
		ConsoleReporter reporter = ConsoleReporter.forRegistry(dropwizardRegistry)
				.convertRatesTo(TimeUnit.SECONDS)
				.convertDurationsTo(TimeUnit.MILLISECONDS)
				.build();
		reporter.start(1, TimeUnit.SECONDS);
		return reporter;
	}

	@Bean
	public MeterRegistry consoleLoggingRegistry(MetricRegistry dropwizardRegistry) {
		DropwizardConfig consoleConfig = new DropwizardConfig() {

			@Override
			public String prefix() {
				return "console";
			}

			@Override
			public String get(String key) {
				return null;
			}

		};

		return new DropwizardMeterRegistry(consoleConfig, dropwizardRegistry, HierarchicalNameMapper.DEFAULT, Clock.SYSTEM) {
			@Override
			protected Double nullGaugeValue() {
				return null;
			}
		};
	}

Note that, in a Spring environment, this registry is added to other implementations in a composite and is used for all metrics, both custom and auto-configured.

class MyComponent {
    private final MeterRegistry registry;

    public MyComponent(MeterRegistry registry) {
        this.registry = registry;
    }

    public void doSomeWork(String lowCardinalityInput) {
        registry.timer("my.latency", "input", lowCardinalityInput).record(() -> {
            // do work
        });
    }
}

The following listing shows typical output for this custom timer:

3/2/18 10:14:27 AM =============================================================

-- Timers ----------------------------------------------------------------------
myLatency.lowCardinalityInput.INPUT
             count = 1
         mean rate = 1.02 calls/second
     1-minute rate = 0.00 calls/second
     5-minute rate = 0.00 calls/second
    15-minute rate = 0.00 calls/second
               min = 100.00 milliseconds
               max = 100.00 milliseconds
              mean = 100.00 milliseconds
            stddev = 0.00 milliseconds
            median = 100.00 milliseconds
              75% <= 100.00 milliseconds
              95% <= 100.00 milliseconds
              98% <= 100.00 milliseconds
              99% <= 100.00 milliseconds
            99.9% <= 100.00 milliseconds