Postman monitors are nothing but collection monitors that are set up and are executed as per the configured frequency. These are generally used when someone wants their collection to run at a particular frequency and the results are required to be monitored with failures being notified through email or slack integration.
Generally, teams with their infrastructure like CI and own cloud servers would not prefer to use Postman defined monitors as it would run only on published or public endpoints or on mocked endpoints (if configured through mock servers).
