What documents, artifacts, deliverables, reports or other means of communication do stakeholders expect or require from the architecture or development team?

Please don’t confuse this with the system requirements.

Some examples might clarify the term:

• Developers of the fooBarexternal interface might expect a detailed description with sample data and code snippets, so they know how to implement this interface (explained in the building block view, arc42 section 5).
• All developers need to know how the system stores cost-relevant furpsdata into our auto-replicated NoSQL datastore (most likely explained in on of the crosscutting concepts in arc42 section 8)
• The product owner calls for a decision log of architecturally relevant decisions (arc42 section 9).
• Operation or administration need to know technical detail of the required database and middleware configuration.