Dear Zabbix, Thanks for 300 Alerts that Disk Space is Low. Take a Chill Pill

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Woke up this morning with 300 emails from Zabbix informing me that a filesystem was low, was resolved, was low, was resolved, was low, was resolved, was low, was resolved, was low, was resolved, was low, was resolved, etc.

Is there a way to tell Zabbix that, for certain kinds of alerts, 1 message per hour is plenty?