How to send alerts only once

I’m having problems with sending alerts. I created a check where I monitor a status (I can change its status from 0 to 1 for the test) this check is a threshold with only two states critc or ok, I am having problems with the notification rules, I need to check this every 30 seconds, but I wanted to send the notification to slack only once and not every 30 seconds, can anyone help me with this problem? thanks

Hello @silvio.coelho,
Welcome! So you want to send a notification only when a stateChange occurs?
Have you tried using:

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it worked out! Thanks for your help