This tutorial is an example of how to create a Mute Alarm Setting. If you want to learn more about Alarms, please consult this article.
Example: If you want to mute Abnormal Upload Alarms when your iMac is accessing subnet 126.96.36.199/24.
Step 1: Tap on "Alarm Settings" on the upper right corner of Alarms page. Tap on "Abnormal Upload".
Step 2: Tap on "Mute". (If the general setting is set to Mute All, there will not be a choice to mute specific device/destination.)
Step 3: Tap on "Add Destination" -> Enter "188.8.131.52/24". (Destination can also be a certain IP Address / Domain.)
Step 4: Tap on "Next" -> Apply to "Annie's iMac". (If you don't want to specify a device, tap on "All Devices.")
The setting will be created under "Mute" -> "Mute Destination". Currently, settings cannot be modified. If you want to modify, delete it first and then recreate it.