These are some standard tag names that are already in common use.
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Content-Type: This tag describes the mime type of the body of the transactions. This tag is used by gateways when serving transaction data over HTTP to set the Content-Type header of the HTTP response.
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App-Name: This tag describes the app that is writing the data
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App-Version: This tag is the version of the app, paired with
App-Name
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Unix-Time: This tag is the a unix timestamp, seconds since epoch.