WordPress at a glance
action is not described

retrieve_password action-hook . WC 1.0

Redefining user_login ensures we return the right case in the email.

Usage

add_action( 'retrieve_password', 'action_function_name_8105' );
function action_function_name_8105( $user_login ){
	// action...
}
$user_login
-

Where the hook is called

WC_Shortcode_My_Account::retrieve_password()
get_password_reset_key()
woocommerce/includes/shortcodes/class-wc-shortcode-my-account.php 297
do_action( 'retrieve_password', $user_login );
wp-includes/user.php 2162
do_action( 'retrieve_password', $user->user_login );

Where the hook is used (in WC core)

Does not used.