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Notes: iOS Unified Logging
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ios-logging.md

From WWDC 2016: Unified Logging and Activity Tracing.

Apple Recommendations

  • os_log: Critical details for debugging issues.
  • os_log_info: Additional information to embed in error or fault reports.
  • os_log_debug: Optional, high-volume information that can be explicitly turned on during development.
  • os_log_error: Additional app information is bundled into the log message.
  • os_log_fault: Additional system information is bundled into the log message.

Heuristics

  • Did something go wrong that was beyond our control?
    • Yes: Was the issue generated by the system outside the app?
      • Yes: os_log_fault
      • No: os_log_error
    • No: Is this information only useful in crash reports?
      • Yes: os_log_info
      • No: Is this noisy information that we only occassionally want to turn on during development?
        • Yes: os_log_debug
        • No: os_log
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