content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  /**
   * A <a href="https://en.wikipedia.org/wiki/Feature_toggle">feature-flag</a> system
   * that is used to proportionally control what features are enabled for the system.
   *
   * <p>In other words, it is a way of altering the control in a system without restarting it.
   * It can be used during all stages of development, its most visible use case is on production.
   * For instance, during a production release, you can enable or disable individual features,
   * control the data flow through the system, thereby minimizing risk of system failures
   * in real time.
   *
   * <p>The <i>feature provider</i> interface is pluggable and easy to integrate with
   * any configuration management system.
   */
  package org.apache.bookkeeper.feature;