Grafana alert not send Resovled when State change to status OK

I have problem function Alerting on Grafana version 6.5.2 Datasource Prometheus. When State change to status OK Grafana not send alert message resolved. I uncheck menu Disable Resolve Message

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Do you have any information in the Grafana server log when you expect a notification to be sent?

t=2020-10-26T14:50:40+0700 lvl=info msg=“New state change” logger=alerting.resultHandler ruleId=19 newState=pending prev state=ok
t=2020-10-26T14:52:40+0700 lvl=info msg=“New state change” logger=alerting.resultHandler ruleId=19 newState=alerting prev state=pending
t=2020-10-26T14:52:40+0700 lvl=info msg=“Executing line notification” logger=alerting.notifier.line ruleId=19 notification=Line_Noti
t=2020-10-26T14:52:40+0700 lvl=info msg=“Creating Line notify” logger=alerting.notifier.line ruleId=19 notification=Line_Noti
t=2020-10-26T14:58:40+0700 lvl=info msg=“New state change” logger=alerting.resultHandler ruleId=19 newState=ok prev state=alerting
t=2020-10-26T14:58:40+0700 lvl=info msg=“Executing line notification” logger=alerting.notifier.line ruleId=19 notification=Line_Noti

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Not sure what the issue could be, but you can reopen the https://github.com/grafana/grafana/issues/16717 issue and maybe add more info following this template:

**What happened**:

**What you expected to happen**:

**How to reproduce it (as minimally and precisely as possible)**:

**Anything else we need to know?**:

**Environment**:
- Grafana version:
- Data source type & version:
- OS Grafana is installed on:
- User OS & Browser:
- Grafana plugins:
- Others:

It would be awesome if you also added your logs.

Thank you for your recommend