Currently, spanner-cli supports per-transaction tag and it is used as the request tag of all queries in the transaction.
#128

Users can be confused by the behavior that multiple queries with the same request tag string are grouped into a single row.

https://cloud.google.com/spanner/docs/introspection/troubleshooting-with-tags?hl=en#things_to_note

When you assign a REQUEST_TAG, statistics for multiple queries that have the same tag string are grouped in a single row in query statistics table. Only the text of one of those queries is shown in the TEXT field.

Possible actions:

a. Add a note to multiple queries with the same tag in the "Transaction Tags and Request Tags" section of the README
b. Add per-request request tag syntax with/without the explicit transaction

Related discussion: #129 (comment) (We are also not familiar with the behavior)