@Override
  public HealthMonitor getHealthMonitor(InternalDistributedMember owner) {
    return hmMap.get(owner);
  }
Returns the health monitor for this distribution manager and owner.

@param owner the agent that owns the returned monitor
@return the health monitor created by the owner; <code>null</code> if the owner has now created
        a monitor.
@since GemFire 3.5
geode-core/src/main/java/org/apache/geode/distributed/internal/ClusterDistributionManager.java