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Dynamic thresholds are based on a percentage in relation to, or a standard deviation from, a baseline built on a rolled-up baseline trend pattern. A daily trend baseline rolls up values for a particular hour of the day during the last thirty days, whereas a weekly trend baseline rolls up values for a particular hour of the day, for a particular day of the week, for the last 90 days.  For more information about baselines, see Dynamic Baselines.
(info) In the case of Databases, you should not use the Default Baseline to set up your health rule conditions.

You can define a threshold for a health rule based on a single metric value or on a mathematical expression built from multiple metric values.

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