public synchronized void deliverEvent() {
      deliverEvent = true;
      notifyAll();
    }
Deliver a memory event from one of the monitors to both local listeners and remote resource
managers. Also, if a critical event is received and a query monitor has been enabled, then the
query monitor will be notified.

Package private for testing.

@param event Event to process.
geode-core/src/main/java/org/apache/geode/internal/cache/control/OffHeapMemoryMonitor.java