Wenjun Ruan

Could you please provide the exception and event detail?

cc #10573

> What about using `TestNG`? This may need to refactor all test code, if we want to use `TestNG` to replace Junit

> > > What about using `TestNG`? > > > > > > This may need to refactor all test code, if we want to use `TestNG` to replace Junit...

> In DolphinScheduler, we sometimes use `Powermock` for UTs. However, it seems `Powermock` does not and will not support jUnit 5. [powermock/powermock#929](https://github.com/powermock/powermock/issues/929) Can we use Mokito to replace powermock?

In fact, I don't think `Fault tolerance warning` should belong to AlertGroup, these should control by `WorkflowInstance` and `TaskInstance`?

> In fact, I don't think `Fault tolerance warning` should belong to AlertGroup, these should control by `WorkflowInstance` and `TaskInstance`? BTW, I find this PR is related to the `server`...

> > In fact, I don't think `Fault tolerance warning` should belong to AlertGroup, these should control by `WorkflowInstance` and `TaskInstance`? > > Maybe plugin instance sounds more considerable (more...

It's OK for me to define a DSL to create a workflow, some geeks may like this way, but this can not work well in big workflow.

@zhongjiajie This PR has some changes about the doc, please take a look.