WordPress at a glance
action is not described

manage_comments_nav action-hook . WP 2.5.0

Fires after the Filter submit button for comment types.

Usage

add_action( 'manage_comments_nav', 'action_function_name_3978' );
function action_function_name_3978( $comment_status ){
	// action...
}
$comment_status(string)
The comment status name.
Default: 'All'

Where the hook is called

WP_Comments_List_Table::extra_tablenav()
manage_comments_nav
wp-admin/includes/class-wp-comments-list-table.php 377
do_action( 'manage_comments_nav', $comment_status );

Where the hook is used (in WP core)

Does not used.