@After
  public void tearDown() throws Exception {
    System.clearProperty(GemFireStatSampler.TEST_FILE_SIZE_LIMIT_IN_KB_PROPERTY);
    disconnect();
  }
Removes the loner DistributedSystem at the end of each test.
geode-core/src/integrationTest/java/org/apache/geode/internal/statistics/GemFireStatSamplerIntegrationTest.java