In Prisma Cloud's alarm center, when an alert notification is deleted, the system is designed to suppress similar alarms for a default duration to prevent alert fatigue and allow administrators to address the underlying issue without being overwhelmed by repetitive notifications. The default suppression duration is set to 12 hours. This means that once an alert is deleted, any similar alarms triggered by the same conditions or configurations will not be generated for the next 12 hours. This feature helps in managing the alert volume, allowing security teams to prioritize and focus on remediation efforts effectively without the distraction of recurring alerts for the same issue.