The new custom alerts plugin is really great!
One Idea to improve it: Sometimes it's important to have an alert as fast as possible.
One example: if you want to be alerted if an event happens more than 2times per hour you have to configure:
now: period: day - event xx - greater than 48
=> if the event happens 3 times a hour you got the first alert after 48 events: that's after 16 hours
better: period: hour - event xx - greater than 2
=> if the event happens 3 times a hour you got the first alert after 3 events: that's after 1 hours
=> That's 15 hours more time to take action!!
thanks for suggestion. In general I'd rather avoid doing "hourly" tasks, because we can never be sure the tasks will run every hour (depends on how often the archive.php cron is running: http://piwik.org/docs/setup-auto-archiving/ )
same goal: shorten time until notification to have more time to take action
but with a different approach: custom alerts: live alert "watch dog" function #4722