Values not set due to expression evaluation rules

A metric is not considered to have been updated unless the new value is different from the original value.

If a metric is not considered to have changed, maps with expressions that are dependent on the changed metric do not execute. So if a metric value gets set, but the new value it is being set to is the same as the default value of the metric (for example, 0 for numeric values), maps that use the metric in an expression will not be called but use the current value of the metric.


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