Sanity.io is our partner that powers the CMS (content management system) underneath your MereChurch website. Because of the way Sanity assigns user roles, everybody with access to your MereChurch is an administrator. This means that all administrators will receive Sanity alerts.
We're in communication with Sanity about smoothing this out. In the meantime, if you receive an Alert email, no action is required on your part. We have received a copy and will take necessary action if need be. Your site will not go down or be inaccessible: if you see that kind of wording from Sanity.io it's not something to worry about.
Thank you for being a great Mere client!