How Uptime robot stores and schedules the cronjobs of monitors at the backend? [closed]

I wanted to know the flow and the technique of the server monitor tools like Uptime robot, Better Uptime, Dotcom-monitor and other tools on how they store and run cronjobs at the defined interval time given by user for the thousands of monitors so fast and reliable.

Wanted to implement an alternative monitoring website but looking for the best approach on how to store the cronjobs for monitors/servers and schedule to run the status check at the backend using Laravel?

Thank in advance.

source https://stackoverflow.com/questions/73533598/how-uptime-robot-stores-and-schedules-the-cronjobs-of-monitors-at-the-backend