{alerts:module_id}

Renders and processes the email-alerts subscription flow for an Alerts module on a public page. Pass the alerts module id (the same id as the module collection, also the reader slice). On a normal page load it returns an empty string. When the page URL carries an aw query parameter (sent in welcome e-mails), it confirms that subscriber e-mail and returns a localized confirmation notice; when it carries an au parameter (sent in alert e-mails, with c the collection id), it unsubscribes that reader and returns a localized notice. If the module id matches no alerts collection it returns empty. Because it reads live query parameters and module state it is never cached. The wiki notes it is an early implementation: at present it handles confirm and unsubscribe; the full subscribe and profile-management form is not yet emitted.