The main problem of each application is to determine how a particular service behaves. Is he in a container or a virtual machine. What kind of load it receives, network delays, who fell and how to carry out a post-mortem. However, cloud solutions have their approaches and solutions. This talk will be about how monitoring set up and problem investigation. On the example of Legacy and microservice-based projects in containers. And what new tools in the AWS appeared over the past year.