Terms
- Application container:- A phyical machine or virtual machine where operation systems run 
- Application instance:- Business codes in deployment packages (such as war). There are multiple code duplications because applications generally run at different service addresses 
- Application cluster:- A cluster composed of multiple application instances 
- Application process:- The operating system process where an application instance runs 
- Application group:- A business cluster (logical concept) composed of multiple application clusters and specified manually 
- Application ID:- The unique identifier of an application type 
- Application instance ID:- The unique identifier of the application instances belonging to the same application type