public static synchronized Region getInstance(InternalCache cache) {
    if (currentInstance != null && currentInstance.getCache() == cache && !cache.isClosed()) {
      return currentInstance;
    }
    if (cache == null || cache.isClosed()) {
      return null; // give up
    }
    initialize(cache);
    return currentInstance;
  }
This is an accessor method used to get the reference of this region. If this region is not yet
initialized, then it attempts to create it.

@param cache the Cache we are currently using
@return ClientHealthMonitoringRegion reference.
geode-core/src/main/java/org/apache/geode/internal/admin/ClientHealthMonitoringRegion.java