Email frequency for the Alerts in Grafana 5.0

Hi

How to set the email frequency for the response time alerts in Grafana 5.0 or 4.6 , Please let me know i need to modify or add any config changes.

I’m able to trigger the alerts for first time after that i’m not getting any alerts. Find my setting belows

Average response time Evaluate every 60s

when avg() of query(A,15m, now) is above 5000

If no data or all values are null SET STATE OF Alerting

If execution error or timeout SET STATE OF Alerting