WordPress at a glance
action is not described

wp_insert_comment action-hook . WP 2.8.0

Fires immediately after a comment is inserted into the database.

Usage

add_action( 'wp_insert_comment', 'action_function_name_7443', 10, 2 );
function action_function_name_7443( $id, $comment ){
	// action...
}
$id(int)
The comment ID.
$comment(WP_Comment)
Comment object.

Where the hook is called

wp_insert_comment()
wp-includes/comment.php 1799
do_action( 'wp_insert_comment', $id, $comment );

Where the hook is used (in WP core)

Does not used.