Throttler: throttler can treat different Apps differently. How does it work?

[newborn22]

As developers, how to register the priority of the App in the throttler? What are all the different ways that the throttler handles Apps, and how do they work?

[newborn22]

Program developers can call the func (throttler *Throttler) ThrottleApp(appName string, expireAt time.Time, ratio float64) (appThrottle *base.AppThrottle) function to let the throttler randomly throttle the appName according to the ratio before the expireAt time.

If the app’s name is in the form of "sub-appName1:sub-appName2:sub-appName3:....." like "75ba763c_6c98_11ee_913d_da3720e3a51e:vreplication:online-ddl", then any sub-appName being throttled will cause the app to be throttled.

In addition, setting the lowPriority in the flags parameter to true when calling func (throttler *Throttler) CheckByType(ctx context.Context, appName string, remoteAddr string, flags *CheckFlags, checkType ThrottleCheckType) (checkResult *CheckResult) mark the app as low priority in this query. During the query process, if any normal priority app is throttled, the low priority app will also be throttled.