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**To update a sampling rule** The following ``update-sampling-rule`` example modifies a sampling rule's configuration. The rules are consumed from a JSON file. Only the fields being updated are required. :: aws xray update-sampling-rule \ --cli-input-json file://1000-default.json Contents of ``1000-default.json``:: { "SamplingRuleUpdate": { "RuleName": "Default", "FixedRate": 0.01, "ReservoirSize": 0 } } Output:: { "SamplingRuleRecords": [ { "SamplingRule": { "RuleName": "Default", "RuleARN": "arn:aws:xray:us-west-2:123456789012:sampling-rule/Default", "ResourceARN": "*", "Priority": 10000, "FixedRate": 0.01, "ReservoirSize": 0, "ServiceName": "*", "ServiceType": "*", "Host": "*", "HTTPMethod": "*", "URLPath": "*", "Version": 1, "Attributes": {} }, "CreatedAt": 0.0, "ModifiedAt": 1529959993.0 } ] } For more information, see `Configuring Sampling, Groups, and Encryption Settings with the AWS X-Ray API <https://docs.aws.amazon.com/en_pv/xray/latest/devguide/xray-api-configuration.html#xray-api-configuration-sampling>`__ in the *AWS X-Ray Developer Guide*.