You can choose comparison as per your need explained below. As per your screenshot you can go with a single mode but raise after 3 to 5 intervals instead of 1.
A comparison mode describes how the metric value should be compared against threshold value. There are three modes to choose from: single, absolute, and relative. The default is single mode, which works as follows:
Review the below link for configuring trigger conditions for alerts.
Thank you for answer
I do not quite understand your explanation.
Condition is configured, given and fulfilled (see the picture) in periods 2-4, 9,11,18-23,29-30,32-33 and 39. It should trigger an alert email only in periods 2,9 , 11,18,29,32 and 39.
Is it possible or not?
Which propagation settings are necessary?
I believe we cannot achieve simply from the propagation settings unless we send the incidents to some other third party event management to control the flow of alerts and then forwarded on the defined intervals.
Review the below link for the available alert propagation settings.
The following needs to be set:
The mail will only be send when you defined in the notifications section that you want to receive an email. And it will send after the first interval the condition is met and the alert is started.