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Another variety of SimpleMetric is a tsDecl Metric. These can be used to turn traditionally non-timeseries data such as event data or status data into timeseries. A tsDecl metric is the same as a SimpleMetric, but instead of an 'expression' field, a 'tsDecl' field is used. tsDecl metrics can sometimes provide some additional flexibility to define new metrics which the expression field may not support. The same example can be re-written as:
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