Under "Base Service Level Agreements", how is "non-production" defined? Two examples coming to my mind: Beta features to be promoted to stable at some point? Support in MW Core for database backends which are not used on Wikimedia servers?
Also, the Priority values (?) imply that someone would have to both regularly and quickly (for UBN/High: less than a week) set the "Priority" field in every task, while I'd say that some teams pretty much ignore the Priority field and prefer for example workboard columns to express planning/urgency of tasks.