Tools / Datadog Interview questions
What is an outlier monitor in Datadog?
An outlier monitor flags a single host, container, or other entity that's behaving statistically different from its peer group - for example, one host in a fleet of fifty with unusually high latency while the rest look normal.
Rather than requiring a fixed, manually chosen threshold, it compares each group member against the others using a statistical algorithm, which is useful when 'normal' varies across a fleet and there's no single absolute number that fits every host.
This makes it well suited for catching the 'one bad instance in a large, otherwise-uniform group' pattern that a plain threshold monitor would either miss or constantly false-alarm on.
An outlier monitor detects entities that:
Outlier monitors are especially useful when:
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