When is it appropriate to switch from monolith to microservices? At what RPS and under what conditions?

Transitioning from a monolith to microservices should not be considered solely based on RPS (requests per second). It is more important to consider a range of factors:

• Complexity and scalability: if the monolith becomes too large, difficult to support and deploy.
• Team structure: when teams grow and responsibility needs to be divided.
• Scaling requirements: if different parts of the application have different loads and require independent scaling.
• Deployment time and development speed: microservices allow for faster release of changes in individual components.

Regarding RPS, there is no strict threshold, but microservices are usually considered when loads reach several thousand RPS, especially when the monolith can no longer handle scaling or becomes a bottleneck.

It is important to remember that microservices add complexity in terms of network interaction, distributed monitoring, and management, so the transition should be justified by architectural and organizational needs, not just load.