MLMD v0.21.0

Release 0.21.0

Major Features and Improvements

• Adding artifact states.
• Supporting connection retries to gRPC server.
• Allowing the Python API put_execution to update or insert related contexts.
• Adding a new execution state: CANCELED. This indicates an execution being
  canceled.
• Adding two event types: INTERNAL_INPUT and INTERNAL_OUTPUT indended to be
  used by mlmd powered systems (e.g., orchestrator).
• Add support to pass migration options as command line parameters to the MLMD
  gRPC server.
• Adding a new Python API get_context_by_type_and_name to allow querying a
  context by its type and context name at the same time.

Bug Fixes and Other Changes

Breaking Changes

• The Python API put_execution will need an extra input argument to pass in
  contexts and return updated context_ids. Users using the old API could pass
  in None or an empty list as context and add another variable to hold the
  returned context_ids to migrate.

Deprecations