Workflow Management API

resume(workflow_id)	Resume a workflow.
resume_async(workflow_id)	Resume a workflow asynchronously.
resume_all([include_failed])	Resume all resumable workflow jobs.
list_all([status_filter])	List all workflows matching a given status filter.
get_status(workflow_id)	Get the status for a given workflow.
get_output(workflow_id, *[, task_id])	Get the output of a running workflow.
get_output_async(workflow_id, *[, task_id])	Get the output of a running workflow asynchronously.
get_metadata(workflow_id[, task_id])	Get the metadata of the workflow.
cancel(workflow_id)	Cancel a workflow. Workflow checkpoints will still be saved in storage. To