MetricSet is only called once

[tbrizard]

I have a simple class that implements the "MetricSet" interface and in the "Map<String, Metric> getMetrics()" method I am getting the HystrixCommandMetrics instances and reporting the current metrics.

I then registered my MetricSet class via the "metrics:register" bean in my Spring configuration. I see the "getMetrics" method called once, but then it is never called again. I am using other MetricsSets, like "com.codahale.metrics.jvm.MemoryUsageGaugeSet" and they work fine. Looking at the code of the other MetricsSet classes I don't see why my class is only called once.

I must be missing something really obvious here.. Any help is appreciated.

    <metrics:register metric-registry="metrics">
        <bean metrics:name="jvm.gc" class="com.codahale.metrics.jvm.GarbageCollectorMetricSet" />
        <bean metrics:name="jvm.memory" class="com.codahale.metrics.jvm.MemoryUsageGaugeSet" />
        <bean metrics:name="jvm.thread-states" class="com.codahale.metrics.jvm.ThreadStatesGaugeSet" />
        <bean metrics:name="jvm.fd.usage" class="com.codahale.metrics.jvm.FileDescriptorRatioGauge" />
        <bean metrics:name="hystrix.metrics" class="com.mycompany.util.metrics.HystrixCodahaleMetricSet" />
    </metrics:register>

public class HystrixCodahaleMetricSet implements MetricSet {

  @Override
    public Map<String, Metric> getMetrics() {

        final Map<String, Metric> gauges = new HashMap<String, Metric>();

        // code to add gauges left out for brevity, but is similar to that in the MemoryUsageGaugeSet class

        return Collections.unmodifiableMap(gauges);
}

[codahale]

You're looking for dropwizard/metrics. This is a Go library.