Function application_default_trace_mode 

pub const fn application_default_trace_mode() -> TraceMode

Runtime collection policy helpers. The enum and its parser live in the kernel; these free functions carry the build-profile and environment bindings that make them a run_method concern. 运行时追踪收集策略的辅助函数。枚举与解析器在 kernel； 以下自由函数承载让它们属于 run_method 面的构建配置与环境绑定。 The policy used by an application runtime when no debug mode is chosen. 未显式选择调试模式时，应用运行时采用的策略。