Fix Spanner metrics (#8541)
Fix Spanner metrics (#8541)

* Fix metric for Get

This was incorrectly being reported as List

* Measure transactions
hartsock/vault,rnaveiras/vault,hashicorp/vault,hashicorp/vault,hartsock/vault,hartsock/vault,rnaveiras/vault,hashicorp/vault,rnaveiras/vault,rnaveiras/vault,rnaveiras/vault,hartsock/vault,hashicorp/vault,hartsock/vault,hashicorp/vault,hashicorp/vault