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Returns a Placeholder that contains runtime information for component.

Currently the runtime info includes following keys:

  1. platform_config: A platform_config proto that contains platform specific information.
  2. executor_spec: The executor spec proto.

key The key of the runtime information.

A Placeholder that will render to the information associated with the key. If the placeholder is proto-valued. Accessing a proto field can be represented as if accessing a proto field in Python.

ValueError If received unsupported key.