groundhogg/contact/note/added
This Groundhogg hook executes when any note is added to the contact.
do_action( 'groundhogg/contact/note/added', $this->ID, $note, $this );
This hook comes with three arguments which is: contact_id: this is the ID of contact, note: this is a text note which is recently added to the contact, and $contact: argument is the object of the contact class.