|Filename||Hook Type||Line Number||PHP Doc|
* Filters whether to attempt to perform the multisite DB upgrade routine.
* In single site, the user would be redirected to wp-admin/upgrade.php.
* In multisite, the DB upgrade routine is automatically fired, but only
* when this filter returns true.
* If the network is 50 sites or less, it will run every time. Otherwise,
* it will throttle itself to reduce load.
* @since MU (3.0.0)
* @param bool $do_mu_upgrade Whether to perform the Multisite upgrade routine. Default true.
|bool||$do_mu_upgrade||Whether to perform the Multisite upgrade routine. Default true.|