WordPress at a glance
filter is not described

get_site filter-hook . WP 4.6.0

Fires after a site is retrieved.

Usage

add_filter( 'get_site', 'filter_function_name_2998' );
function filter_function_name_2998( $_site ){
	// filter...

	return $_site;
}
$_site(WP_Site)
Site data.

Where the hook is called

get_site()
get_site
wp-includes/ms-blogs.php 541
$_site = apply_filters( 'get_site', $_site );

Where the hook is used (in WP core)

Does not used.