Retrieving the full text of a SQL statement - value for "--group-identifier"

the --group-identifier is db.sql.id. In this example, my-sql-id represents a SQL ID retrieved by invoking pi get-resource-metrics or pi describe-dimension-keys

when I try using --group-identifier db.sql.id

I get:

An error occurred (InvalidArgumentException) when calling the GetDimensionKeyDetails operation: This Key ID is not valid.

and there is no guidance on what to use from get-resource-metrics or pi describe-dimension-keys

Can someone provide more information?