MoleculerJS: high-load, fault tolerance and distributed microservices

Let's talk about the difference between services and microservices, what are transports, what metrics to collect and how to trace a distributed requests. What is needed in a microservices framework to cover basic development tasks. What are the fault tolerance techniques exist in microservices and how do they differ. What are the features of working with databases in a microservice architecture, what is SAGA and how distributed transactions work. Is it possible to implement a two-way communication between microservices and external systems. And what are the benefits of events with guaranteed delivery? You can learn about all of this on the example of the Moleculer framework.