* Add AddSplitPoints API
* Add Attempt, Operation and GFE Metrics (#1302)
* Add REST Interceptors which support reading metadata
* Add support for opt-in debug logging
* Add support for reading selective GAPIC generation methods from service YAML
* Add the last statement option to ExecuteSqlRequest and ExecuteBatchDmlRequest
* Add UUID in Spanner TypeCode enum
* End to end tracing (#1315)
* Exposing FreeInstanceAvailability in InstanceConfig
* Exposing FreeInstanceMetadata in Instance configuration
(to define the metadata related to FREE instance type)
* Exposing InstanceType in Instance configuration
(to define PROVISIONED or FREE spanner instance)
* Exposing QuorumType in InstanceConfig
* Exposing storage_limit_per_processing_unit in InstanceConfig
* Snapshot isolation (#1318)
* **spanner:** A new enum `IsolationLevel` is added (#1224)
* Allow Protobuf 6.x (#1320)
* Cleanup after metric integration test (#1322)
* **deps:** Require grpc-google-iam-v1 >= 0.14.0
* Fix typing issue with gRPC metadata when key ends in -bin
* Add option for last_statement (#1313)
* A comment for enum `DefaultBackupScheduleType` is changed
* A comment for enum value `AUTOMATIC` in enum `DefaultBackupScheduleType` is changed
* A comment for enum value `GOOGLE_MANAGED` in enum `Type` is changed
* A comment for enum value `NONE` in enum `DefaultBackupScheduleType` is changed
* A comment for enum value `USER_MANAGED` in enum `Type` is changed
* A comment for field `base_config` in message
`.google.spanner.admin.instance.v1.InstanceConfig` is changed
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python:google/python-google-cloud-spanner?expand=0&rev=12
