The GSuite Login Type detection rule monitors user login activities for non-approved login types. It specifically checks the login events for users and compares the types of logins with a predefined list of approved types. If a login occurs using an unapproved type, it triggers a report indicating a potential security issue. For instance, the rule will mark a login event as suspicious if a user logs in using a 'turbo-snail' type, while approved login types such as 'saml' are allowed and considered safe. This rule helps identify possible unauthorized access attempts, enhancing user account security within GSuite by ensuring that only verified login methods are utilized. The severity of this rule is categorized as medium, indicating a notable potential risk. The runbook provides guidance to remediate such issues by correcting user account settings to restrict login types to those that are accepted.