apollo-client/src/main/java/com/ctrip/framework/apollo/internals/AbstractConfig.java/AbstractConfig/removeChangeListener
class AbstractConfig:  @Override
  public boolean removeChangeListener(ConfigChangeListener listener) {
    m_interestedKeys.remove(listener);
    m_interestedKeyPrefixes.remove(listener);
    return m_listeners.remove(listener);
  }