private void assertContainerUsageMapAllZero(Map<String, Map<String, Long>> usageMap) {
    boolean allZero =
        usageMap.values().stream().flatMapToLong(m -> m.values().stream().mapToLong(v -> v)).allMatch(v -> v == 0);
    assertTrue(allZero);
  }
Test to update container storage usage monthly base.
ambry-quota/src/integration-test/java/com/github/ambry/quota/storage/MySqlStorageUsageRefresherTest.java