Is there any way to track Schema version usage? e.g. determine the last time a schema version was used

[frankgrimes97]

As versions of a schema get deployed and used over time, it would be nice to be able to have some confidence before pruning old versions from the Schema Registry.
i.e. no producers are still publishing using an older version of the schema
Do Pulsar brokers track accesses to or use of schemas by version?
If not, might that be a useful feature to add? Perhaps captured as Micrometer metrics?