The data range displayed by default in alarm monitoring trend chart is incorrect.

Created by: wenxin-01

Preset conditions 1、There is account A, which has cluster management privileges. 2、Use account A to log in to KS, and go to Platform management--》Cluster "B" management--》Alerting Policies. 3、There is a policy ‘test’

To Reproduce Steps to reproduce the behavior:

1. click policy 'test'
2. View alarm monitoring trend chart

Expected behavior The time range of the trend chart is consistent with that of the display

Actual behavior The time range of the trend chart is 30 minutes but the time range shown is one day

/priority medium /area alerting /cc @leoendless /kind bug /milestone 3.1.0