Anomaly detection threshold

rudolf_castelin — Wed, 13 Jul 2022 12:53:25 GMT

Based on the docs here, say we have configured to use a 5-minute sliding window where 3-minute samples need to violate the threshold to raise an event.

What happens if, the anomaly is detected only twice every 5 mins over1 hour?

1100 - 1105 - failed 2 times
1105 - 1110 - failed 2 times
1110 - 1115 - failed 2 times

1155 - 1200 - failed 2 times

Will an alert still be created?

Will the AI baseline the service against a threshold, where even if the anomaly is detected few times, every 5 mins, once the error rate for the service crosses the threshold, an alert is generated?

Re: Anomaly detection threshold

mgome — Thu, 14 Jul 2022 00:00:52 GMT

The 5 minute sliding window doesn't slide in 5 minute increments. It's a five minute window that slides every minute. The window starts at the first occurrence. The answer to your question depends on where in those time blocks the condition occurs. Using the first two time blocks, if the condition occurs at 1104, the window starts and the window slides to the next minute. Then if there's a reoccurrence in at 1107 (in window) and 1108 (in window), you would get an alert.

1104	1105	1106	1107	1108
*			*	*

Now if the condition does not re-occur in the 1109 minute the event would resolve because the 1104 event would fall outside the five minute window.

topic Re: Anomaly detection threshold in Alerting

Anomaly detection threshold

Re: Anomaly detection threshold