Logging levels for Swift's server-side logging APIs and new os_log APIs

Evolution Pitches
17

I mostly agree with @ktoso comment:

  • +1 for syslog as baseline
  • +1 for adding levels above error
  • +1 for adding Trace

Things I'd like to add:

  • Description for Trace: “Messages that might to be useful when searching hard to track bugs. This is purely opt-in, it is disabled by default even in standard debug builds. (E.g. Things like Entering/Leaving function)”

  • Naming of the levels: What's worse, an alerting situation or a critical situation?

    • Rename Alert to Fatal: Alerts are dialogs that users ignore. This does not fit here.
    • Rename Emergency to Panic: Kernel-panics are well known and this is the equivalent.
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