我找到了一个解决办法。创建一个插件，在网络范围内激活。这对于mu安装非常重要。如果检查只在插件中进行，那么mu安装的博客中有活动的，那么检查只在该博客中进行，更新检查和通知在网络中进行。

定义插件，您将不会在var数组中检查更新$blocked_plugins.

<?php
/**
 * Plugin Name: Plugin updates blocker
 * Plugin URI:  
 * Description: Disable plugin update check for specific plugins list
 * Version:     1.0.0
 * Author:      Frank Bültge
 * Author URI:  http://bueltge.de
 * License:     GPLv3
 */

! defined( \'ABSPATH\' ) and exit;

add_filter( \'http_request_args\', \'fb_block_update_specific_plugins\', 5, 2 );
function fb_block_update_specific_plugins( $r, $url ) {

    //var_dump( unserialize( $r[\'body\'][\'plugins\'] ) );

    if ( 0 !== strpos( $url, \'http://api.wordpress.org/plugins/update-check\' ) )
        return $r;

    // array for the plugin slug - folder/file
    $blocked_plugins = array(
        \'oembed-gist.php\', // plugin without folder
        \'subtitle/class-post_subtitle.php\',
        \'wp-slabText/wp-slabtext.php\',
    );
    if ( 0 === (int) count( $blocked_plugins ) )
        return $r;

    $installed_plugins = unserialize( $r[\'body\'][\'plugins\'] );
    foreach( $blocked_plugins as $p ) {
        unset( $installed_plugins->plugins[ $p ] );
        unset( $installed_plugins->active[ array_key_exists( $p, $installed_plugins ) ] );
    }
    $r[\'body\'][\'plugins\'] = serialize( $installed_plugins );

    return $r;
}