2024
SpringIO - Distributed Scheduling with Spring Boot: the challenges & pitfalls of implementing a background job 0:00 of 46:16
    https://www.youtube.com/watch?v=ghpljMg8Ecc
    https://speakerdeck.com/rponte/distributed-scheduling-with-spring-boot-the-challenges-and-pitfalls-of-implementing-a-background-job
2021
DevmarkRu - Scheduler in Spring ru of 10:14
    https://www.youtube.com/watch?v=gJbhPjNSm9k
2019
SpringAcademy - Spring Boot @Scheduled Crash Course of 14:20
    https://www.youtube.com/watch?v=92-qLIxv0JA