Adding Tags to an existing measurement

Hi Team, we have a table in prod which currently has around 300m rows, we have a business requirement to add another identifier field as a tag, this tag won’t increase cardinality as it’s associated with an existing tag.

The purpose of adding this tag is to configure the required label on Grafana. Could you please advise on the dos and donts of adding a tag to a table that’s been living a long time in our prod environment and what is the best way to backfill values for the 300m rows?

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