[bugfix] fix alarm threshold ava can not modify

[tomsun28]

What's changed?

close #2493

Checklist

• I have read the Contributing Guide
• I have written the necessary doc or comment.
• I have added the necessary unit tests and all cases have passed.

Add or update API

• I have added the necessary e2e tests and all cases have passed.

[Aias00]

if the cascade values have been changed first, and recover later, and then click submit . the form can bu submiited. simplely check the cascade values length may can not slove the problem

[Aias00]

when click submit button first time, the cascade values length is 2 and qbdata is empty;

modify the cascade value, make it`s length 3, then add a empty rule , it can be submitted successfully, and the rule value will be undifined actually

do not remove this empty rule , just change cascade values, and the form can be submitted successfully this time.

[tomsun28]

hi, sorry for not got it. Do you means the empty rule should be verification failed, the form can not be submiited.? This maybe an another bug.

The cascade values length only mapping with the Metric Target Switch, if choose the Availability, cascade length is 2, if choose others metrics, length is 3.

[Aias00]

hi, sorry for not got it. Do you means the empty rule should be verification failed, the form can not be submiited.? This maybe an another bug.

The cascade values length only mapping with the Metric Target Switch, if choose the Availability, cascade length is 2, if choose others metrics, length is 3.

yeap, this empty rule can submitted successfully situation may be another bug. all i want to say, it`s that :

1. if u changed the cascade value to 3 length、add some rule and then change it back to 2 length. it can be submitted; cause the rules datas were not cleared. and this can let the form check control valid. oh, this may be another bug 🤣
2. when 2 length cascade , the form check control should allows the form`s submiting. and this pr can fix it appropriately

[Aias00]

lgtm

[tomsun28]

• if u changed the cascade value to 3 length、add some rule and then change it back to 2 length. it can be submitted; cause the rules datas were not cleared. and this can let the form check control valid. oh, this may be another bug 🤣

Got it thanks, i will fix it.