@Bean
    @ConditionalOnMissingBean(ApolloDataChangedListener.class)
    public DataChangedListener apolloDataChangeListener(final ApolloClient apolloClient) {
        return new ApolloDataChangedListener(apolloClient);
    }
Config event listener data changed listener.

@param apolloClient the apollo client
@return the data changed listener
shenyu-admin-listener/shenyu-admin-listener-apollo/src/main/java/org/apache/shenyu/admin/config/ApolloSyncConfiguration.java