public Map<String, MetricsReporterFactory> getMetricsReporterFactories() {
    return Collections.unmodifiableMap(reporterFactories);
  }
Get the {@link MetricsReporterFactory}s used in the application

@return the map of {@link MetricsReporterFactory}s
samza-core/src/main/java/org/apache/samza/application/descriptors/ApplicationDescriptorImpl.java