private InternalDistributedSystem createSystem(Properties props,
      MetricsService.Builder metricsSessionBuilder) {
    system = new InternalDistributedSystem.Builder(props, metricsSessionBuilder)
        .build();
    return system;
  }
A connection to a distributed system created by this test
geode-core/src/integrationTest/java/org/apache/geode/distributed/internal/InternalDistributedSystemIntegrationTest.java