@Override
  public String toString() {

    return super.toString() + "Function ID:" + functorId + "\n";
  }
Implementation of {@link StatAlertDefinition}, which defines function Function to be applied on
all the statistic Threshold is valid for value evaluated by function
geode-core/src/main/java/org/apache/geode/internal/admin/statalerts/FunctionDecoratorImpl.java