v1.26.0 Release

BigQuery

NOTE This release includes an experimental BigQuery Storage Read client
library. This library is NOT GA and is likely to have breaking changes in
the coming months. Feel free to take a look, file issues, ask questions, and
even experiment with it, but do not ship production code using it yet.

• feature(bigquery): add quickstart (#6116)
• feature(bigquery): add success case integration tests (#6102)
• feature(bigquery): storage library generation (#5989)

Bigtable:

BREAKING CHANGES:

• bigtable::AdminClient, bigtable::DataClient, and
  bigtable::InstanceAdminClient each gained a new, pure virtual
  BackgroundThreadsFactory() member function, requiring anyone who derives
  from those classes to implement that function. This would typically only
  affect users who create mock clients for testing purposes.

OTHER CHANGES:

• feat(common): experimental logging configuration (#6049)
• feat(bigtable): Bind CompletionQueue with Table (#6012)
• feat: bind CompletionQueue with TableAdmin (#6004)
• feat: bind CompletionQueue with InstanceAdmin (#5967)
• feat(bigtable): enable keepalive pings by default (#5969)

Pub/Sub

• feat(pubsub): schemas are no longer experimental (#6115)
• fix(pubsub): deadlocks for cancel during session startup (#6055)
• feat(common): experimental logging configuration (#6049)
• doc(pubsub): fix region tags for two examples (#5944)

Storage

• doc(storage): always use signing account in examples (#6149)
• feat(storage): self-signed JWTs for service accounts (#6096)
• doc(storage): better description for ObjectWriteStream (#6075)
• cleanup: deprecate some IAM types (#6069)
• fix(storage): move disabling consts (#6064)
• fix(storage): use after move problems (#6066)
• feat(common): experimental logging configuration (#6049)
• doc(storage): describe how to use optional parameters (#5983)
• fix(storage): correctly set customTime on inserts (#5980)
• fix(storage): do not update upload session ids (#5979)
• feat(storage): implement storage::GrpcClient::TestBucketIamPermissions (#5957)
• feat(storage): implement storage::GrpcClient::DeleteResumableUpload (#5941)

Spanner

• feature(spanner): request priority (#6103)
• feature(spanner): update CMEK samples (#6120)
• feature(spanner): customer-managed encryption (#6087)
• feat(common): experimental logging configuration (#6049)
• feat(spanner): connection factories now prefer Options (#6046)
• feat(common): make Options public (#6042)
• doc(spanner): fix expected option lists (#6029)

Common libraries

• feat(common): experimental logging configuration (#6049)
• feat(common): log the last N entries (#6048)
• feat(common): make google::cloud::Options public (#6042)