static void verifyReceivedMarkerAck() {
    await().atMost(3 * HEAVY_TEST_LOAD_DELAY_SUPPORT_MULTIPLIER, MINUTES)
        .pollInterval(200, MILLISECONDS)
        .until(HARegionQueue::isTestMarkerMessageReceived);
  }
Returns the durable client proxy's HARegionQueue region name. This method is accessed via
reflection on a server VM.

@return the durable client proxy's HARegionQueue region name
geode-cq/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/DurableClientTestBase.java