@VisibleForTesting
  public void addProcessStats(ProcessStats processStats) {
    if (processStats != null) {
      systemStatsMonitor.addStatisticsToMonitor(processStats.getStatistics());
    }
  }
This class acts as an Bridge between MemberMBean and GemFire Cache and Distributed System
geode-core/src/main/java/org/apache/geode/management/internal/beans/MemberMBeanBridge.java