Raise alarm on deviation from normal values

[Abraxas]

Hi,

I am looking for a way to generate alarms when the values of a monitored resource drop below certain values compared to what is expected at that time.
To be more precise: I am monitoring the number of sessions on a server (or the bandwidth usage on an interface). The volume fluctuates during the day, being way lower during the nights, but it repeats daily in about the same shape (like a sinus graph).
I would like to raise an alarm if the values drop below a certain value normal for that time of day (like if normally the lowest value at night is 400, to raise an alarm when it drops below 250 or something like this; while during the day is should drop below let's say 2000).

The only way I see this doable so far is by creating 1 data collection with custom schedule that runs once or a few times in each interval I want to set a stable threshold. This is not elegant and neither easy to scale/maintain, so I was hoping you guys have a better way to handle this...

Thanks,
Alex

[dmna007]

Did you ever find a solution to this?  I want to monitor outbound network card bandwidth utilisation and if over the normal baseline by say 20% generate an alarm.

Thanks, Damien