Only tell them about disk alerts.

Alerts › rules. Kinds sit under the tags. Disk is one tick. None ticked still means every kind.

A disk rule does not stop the hub from raising a downtime or a check failure. It only decides which of those become a message.

Tick disk

Open Alerts › rules and press + rule. Under kinds, tick disk and leave the others clear. None ticked still means every kind. The address is typed and not added yet. Type and tags left empty cover every machine.

New alert rule with the disk kind ticked and an email address in the contact field — New rule with disk ticked. The address is not a contact yet.

Read the sentence, then add the rule

Press add contact. The grey sentence reads: tell email ops@example.com when a warning or worse (disk) opens on 4 machines in Example Co, and again when it resolves. Press add rule when that sentence is the one you want. This shot stops before that. A later edit of the same rule is Change an alert rule.

Rule editor with disk ticked, an email contact, and a preview that names disk — The sentence names disk and ops@example.com. Add rule saves it. Nothing has been saved in this shot.

A rule for every kind is Tell someone when a machine needs attention. Only downtime is Only tell them about downtime. A new external IP or a WAN failover is Only tell them when the network path changes. A Docker app is Only tell them about a Docker app. A failing check is Only tell them about a failing check. A reboot is Only tell them about a reboot. A custom metric is Only tell them about a custom metric. Servers only, whatever the kind, is Limit an alert rule to servers. A desktop that should stay quiet overnight is Leave a desktop out of offline alerts.