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Quality requirements typically differ among software features, e.g., due todifferent usage contexts of the features, different impacts of related qualitydeficiencies onto overall user satisfaction, or long-term plans of thedeveloping organization. For instance, maintainability requirements might beparticularly high for software features which are frequently used or bearstrategic value for the developing organization. Also, software features whereeven the smallest delays are perceived as negative by the user will besubjected to specially tight performance requirements.  We defined an operational DSL to define software quality requirements asindividual feature-level constraints based on quantitative measures. The DSLprovides language elements to define the operationalization of measures fromexternal systems, time series operations, time filters, and the automaticevaluation of these feature-level constraints in DevOps based on comparisonoperators and threshold values. In addition, quality ratings summarizeevaluation results of features on an ordinal grading scheme. Likewise, qualitygates use these quality ratings to reflect the fitness of software features orthe overall software product using different states. Finally, we show anexample based on a widely-adopted secure mobile messaging app that illustratesthe interplay of the different DSL elements.

A DSL for Defining Feature-Level Quality Constraints and the Aggregation of Evaluation Results in DevOps