I sent out an email message to people. I included a link with their checksum to a profile so they can review/update their info.
I can tell from the civicrm_log or civicrm_contact if they changed any of their contact info, but what if I want to know just if they visited the page even if they didn't change anything? Or if they changed something in the profile that is a custom field which doesn't update the log or contact?
Is there something on the drupal side maybe? The contacts don't have a drupal user.