How to get a single Notification Alert through cloudwatch alarms, when the Site-To-Site VPN Tunnel is back to normal

Question

I have implemented a cloudwatch alarm that alerts when the tunnel goes down. But, I also want to be notified when the tunnel is back again online.
Initially I had added a action step for "OK" state, but what it does is when the alarm is back into OK state from "IN ALARM" state it continues to send the alerts as long the alarm is in OK state.

I want alerts to be send as long as the tunnel is down but only, one time when the tunnel is back to normal and is in up state.

Answer

Usually, CloudWatch Alarm is notified only when the state changes.
I want to check your notification settings, which metrics are being notified, and under what conditions.

Do you have a recurring notification mechanism, such as the one described in the following Blog, to ensure continuous notifications?

https://aws.amazon.com/jp/blogs/mt/how-to-enable-amazon-cloudwatch-alarms-to-send-repeated-notifications/

How to get a single Notification Alert through cloudwatch alarms, when the Site-To-Site VPN Tunnel is back to normal

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