WordPress at a glance
function is not described

multisite_over_quota_message() WP 3.5.0

Displays the out of storage quota message in Multisite.

No Hooks.

Return

Nothing (null).

Usage

multisite_over_quota_message();

Code of multisite over quota message: wp-admin/includes/media.php WP 5.2.2

<?php
function multisite_over_quota_message() {
	echo '<p>' . sprintf(
		/* translators: %s: allowed space allocation */
		__( 'Sorry, you have used your space allocation of %s. Please delete some files to upload more files.' ),
		size_format( get_space_allowed() * MB_IN_BYTES )
	) . '</p>';
}