The Maestro Monitoring tab's Variable filter builder only offers variables that were explicitly marked as searchable on the Maestro canvas before the process was deployed, which is the documented requirement the question tests. Being tied to a gateway decision (A) is not a requirement, global-scope declaration (B) is not mentioned as a condition, and having appeared in a completed instance (C) does not matter because filtering only applies to instances run after it is set up. Option D is therefore the only option matching a documented condition.
Community Discussion