public <A extends ClusterManagementOperation<V>, V extends OperationResult> void registerOperation(
      Class<A> operationClass,
      OperationPerformer<A, V> performer) {
    performers.put(operationClass, performer);
  }
for use by modules/extensions to install custom cluster management operations
geode-core/src/main/java/org/apache/geode/management/internal/operation/OperationManager.java