SamplingRuleUpdate  
    class SamplingRuleUpdate
A document specifying changes to a sampling rule's configuration.
Types
Properties
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                  Matches attributes derived from the request.
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                  Matches the HTTP method of a request.
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                  A fixed number of matching requests to instrument per second, prior to applying the fixed rate. The reservoir is not used directly by services, but applies to all services using the rule collectively.
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                  Matches the ARN of the Amazon Web Services resource on which the service runs.
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                  Specifies the multiplier applied to the base sampling rate. This boost allows you to temporarily increase sampling without changing the rule's configuration.
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                  Matches the name that the service uses to identify itself in segments.
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                  Matches the origin that the service uses to identify its type in segments.