What is the process for connecting to multiple GCP Spanner databases/instances through Spring Cloud GCP Starter?

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To connect to multiple GCP Spanner databases/instances through Spring Cloud GCP Starter, follow these steps:

1. Add the appropriate dependency for Spring Cloud GCP Starter to your project.

2. Create a configuration file that specifies the necessary properties for connecting to each database/instance, including the instance id, database name, project id, and credentials file location.

3. Modify your Spring Boot application to use the configuration file.

4. Create a bean for each SpannerTemplate (one per database/instance) in your Spring configuration, and specify the database/instance in each bean's constructor.

5. Use the appropriate SpannerTemplate when performing read and write operations on the corresponding database/instance.

Note that you can also use the @SpannerConnection annotation on your Spring components to specify which SpannerTemplate to use for a particular operation. This can be useful if your application needs to perform operations on multiple databases/instances within the same method.