Which type of services are NOT mentioned as part of fixed thresholds?

The correct choice highlights software version control services as the type not mentioned in the context of fixed thresholds. In application performance management, especially with tools like Dynatrace, fixed thresholds are generally applied to metrics related to services that are performance-oriented, such as application services, infrastructure services, and database services. These categories inherently rely on quantifiable performance metrics where fixed thresholds can be established, such as response times, error rates, and resource usage.

Software version control services, on the other hand, primarily deal with the management of changes to source code and do not typically involve fixed thresholds for performance monitoring. Their focus is on versioning and collaboration in software development rather than directly tying to operational metrics that dictate performance limits. This distinction highlights the relevance of fixed thresholds primarily in performance-sensitive areas rather than in the domain of version control, which does not inherently require such metrics to maintain operational integrity.