Features
- Include VM CID in agent ping error message (#169682585)
- Add support for customer-provided encryption keys with signed URLs on GCS (#168148185)
- Add prometheus metrics for director api (#169331435)
- overall metrics work still in progress
- Default blobstore nginx workers to auto (#169988440)
- Update VM/disk metadata when deploy tags change without need for
--recreate(#168917397)
Bug Fixes
- Skip full instance update iff DNS or tags changed (#168917397)
- Fix nginx.conf not using SSL for ipv6 listen (#169694744)