wpmu_options
Action Hook: Fires at the end of the Network Settings form, before the submit button.
Source: wp-admin/network/settings.php:541
after_mu_upgrade
Action Hook: Fires after the Multisite DB upgrade for each site is complete.
Source: wp-admin/network/upgrade.php:113
wpmu_upgrade_site
Action Hook: Fires after each site has been upgraded.
Source: wp-admin/network/upgrade.php:122
wpmu_upgrade_page
Action Hook: Fires before the footer on the network upgrade screen.
Source: wp-admin/network/upgrade.php:152
do_activate_header()
Function: Adds an action hook specific to this page.
Source: wp-activate.php:106
wpmu_activate_stylesheet()
Function: Loads styles specific to this page.
Source: wp-activate.php:123