Policies can involve complex workflows, sometimes including authorizers and approvers. When creating a policy with one of these, they receive an email/notification prompting them to approve or authorize the action/step in the policy rule once it has been triggered. Once the authorizer/approver has received the email/notification, they have 3 days to approve or authorize the action.
Incomplete approvals and authorizations can lead to a status of "pending" in some menus, including the health check status.