From a Go application, how should you write to Cloud Spanner to follow Google-recommended performance best practices?

The Cloud Client Libraries (also known as idiomatic client libraries) are the Google-recommended way to interact with Google Cloud services, including Cloud Spanner. These libraries are optimized for performance, handle authentication, retry logic, and connection management automatically, and provide an idiomatic interface for each language. This ensures efficient and reliable communication with Cloud Spanner. The Google API Client Libraries are lower-level and less idiomatic, requiring more manual configuration. A custom gRPC client would necessitate implementing all the necessary Spanner API logic, authentication, and error handling, which is complex and error-prone. A third-party HTTP client library would not leverage gRPC, which Cloud Spanner uses for high-performance communication, and would lack built-in optimizations and features provided by Google's client libraries.