[rrd-users] failure detection at night - how to disable it

[Rafal Gwizdala]

Hi, I'm experimenting with hwpredict failure detection in business activity
data (detecting anomalies in mass scale business processes) and have a
problem with false positives at night.
Since the activity at night is very small there's no way to accurately
predict it - usually the statistics are at zero+epsilon, but even a small
number of events (like few customers sending complaints at midnight)
generates a spike that's outside the predicted deviation. Also, the value
of zero is quite often outside the deviation (because the average during
the night is slightly greater than zero, but individual spikes occur
randomly and cannot be predicted).
So i think the best solution would be to disable the failure detection at
night time (for example between 10pm and 6am). Can you suggest an elegant
way of doing that?
Best regards
RG
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