Tags
Add name and value tags to an endpoint through Flow Studio, then you can view and filter Activity results by those tags.
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Navigate to Flows and then click the name of the flow for which you want to add tags to an endpoint.
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In Flow Studio, click an endpoint in either Sources or Targets, or add a new one.
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In the Flow Endpoint Editor, click the Tags tab.

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Add name and value tags to categorize the flow endpoint. Name is case-insensitive, must be unique within the endpoint, and is required. Value is optional.
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Click Save Changes.