...
Outlier monitors detect when a member of a group (e.g., hosts, availability zones, partitions) is behaving unusually compared to the rest. Each alert evaluation checks whether or not all groups are clustered together, exhibiting the same behavior. An alert is triggered whenever at least one group diverges from the rest of the groups. Understand and use available configurations in the configure section.
Anomaly Alert
An anomaly alert uses past behavior to detect when a metric is behaving abnormally. Anomaly monitors detect when a metric is behaving differently than it has in the past, taking into account trends and seasonal day-of-week and time-of-day patterns. Understand and use available configurations in the configure section.
...