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Simple Log Service:Anomaly types

Last Updated:Jun 16, 2026

Intelligent inspection detects several types of anomalies. Understanding these types helps you monitor and maintain system stability more effectively.

Anomaly type

Label

Description

Stab

Stab

The inspected metric suddenly fluctuates during off-peak hours, or the metric values change before a Shift anomaly occurs. Stab

Shift

Shift

The metric values shift to a new range compared to previous levels and remain stable. Shift anomalies typically occur before and after changes in business patterns. Shift

Variance

Variance

The overall average of the inspected metric remains similar, but the variance changes. Variance

Lack

Lack

Some data samples of the inspected metric are missing. Lack

OverThreshold

OverThreshold

The inspected metric exceeds the threshold you specified. When this occurs, Simple Log Service generates alerts regardless of algorithm results. OverThreshold