Add a hostname-aware reporter factory.

service/src/main/java/org/whispersystems/textsecuregcm/metrics/SignalDatadogReporterFactory.java

@@ -0,0 +1,74 @@
+/*
+ * This is derived from Coursera's dropwizard datadog reporter.
+ * https://github.com/coursera/metrics-datadog
+ */
+
+package org.whispersystems.textsecuregcm.metrics;
+
+import com.codahale.metrics.MetricRegistry;
+import com.codahale.metrics.ScheduledReporter;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+import io.dropwizard.metrics.BaseReporterFactory;
+import java.util.EnumSet;
+import java.util.List;
+import javax.validation.Valid;
+import javax.validation.constraints.NotNull;
+import org.coursera.metrics.datadog.DatadogReporter;
+import org.coursera.metrics.datadog.DatadogReporter.Expansion;
+import org.coursera.metrics.datadog.DefaultMetricNameFormatterFactory;
+import org.coursera.metrics.datadog.DynamicTagsCallbackFactory;
+import org.coursera.metrics.datadog.MetricNameFormatterFactory;
+import org.coursera.metrics.datadog.transport.AbstractTransportFactory;
+import org.whispersystems.textsecuregcm.util.HostnameUtil;
+
+@JsonTypeName("signal-datadog")
+public class SignalDatadogReporterFactory extends BaseReporterFactory {
+
+  @JsonProperty
+  private List<String> tags = null;
+
+  @Valid
+  @JsonProperty
+  private DynamicTagsCallbackFactory dynamicTagsCallback = null;
+
+  @JsonProperty
+  private String prefix = null;
+
+  @Valid
+  @NotNull
+  @JsonProperty
+  private MetricNameFormatterFactory metricNameFormatter = new DefaultMetricNameFormatterFactory();
+
+  @Valid
+  @NotNull
+  @JsonProperty
+  private AbstractTransportFactory transport = null;
+
+  private static final EnumSet<Expansion> EXPANSIONS = EnumSet.of(
+      Expansion.COUNT,
+      Expansion.MIN,
+      Expansion.MAX,
+      Expansion.MEAN,
+      Expansion.MEDIAN,
+      Expansion.P75,
+      Expansion.P95,
+      Expansion.P99,
+      Expansion.P999
+  );
+
+  public ScheduledReporter build(MetricRegistry registry) {
+    return DatadogReporter.forRegistry(registry)
+        .withTransport(transport.build())
+        .withHost(HostnameUtil.getLocalHostname())
+        .withTags(tags)
+        .withPrefix(prefix)
+        .withExpansions(EXPANSIONS)
+        .withMetricNameFormatter(metricNameFormatter.build())
+        .withDynamicTagCallback(dynamicTagsCallback != null ? dynamicTagsCallback.build() : null)
+        .filter(getFilter())
+        .convertDurationsTo(getDurationUnit())
+        .convertRatesTo(getRateUnit())
+        .build();
+  }
+}