today I want to document one important feature of implementing microservices. It is Correlation ID. Basically if you have ten microservices exeucting, and want to know how data is transformed between services, it is good idea to make some value which will travel between services. In that case it will be easy for you to see, what was condition of the systmem in case if you'll make some kind of analysis. It can be order filling with some information. Also that correlation id can be preserved in Central logging of microservices.