Limiting the number of alerts?

Limiting the number of alerts?

So I have an alert set up to notify me if there are 5 denied attempts through the firewall (log coming from syslog) in a 5 minute span. However if a device goes haywire, tries to connect through the firewall 4 times every second, I'm still gonna get 10,000 messages in like a half hour (message 5 comes in, has it been less than 5 minutes? send! message 6 comes in, has it been less than 5 minutes? send! ...)

So how are other folks dealing with this? When they'd prefer to see the same alert email only generated once every 5 minutes for example? Lemme guess? Firewall Analyzer? Alerting from the firewall itself?

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