The slog.Record.PC field can be loaded with a program counter (PC). This is normally done by the slog.Logger code. If the PC is non-zero and the slog.HandlerOptions.AddSource flag is set the source field will contain a slog.Source record containing the function name, file name, and file line at which the log record was generated. If the PC is zero then this field and its associated group should not be logged.

• "- If r.PC is zero, ignore it."

The field name of the "message" key should be msg.

• Constant values are defined for slog/log
  
• Field values are defined for the JSONHandler.Handle() implementation

Each JSON log record contains the logging level of the log statement as a string. Different handlers provide that string in uppercase or lowercase. Documentation for slog.Level says that its String() and MarshalJSON() methods will return uppercase but UnmarshalJSON() will parse in a case-insensitive manner.

If a warning is specified but the condition is not actually present one of these warnings will be issued with the specified warning. These are intended to help clean out unnecessary WarnOnly settings from a test suite as issues are fixed in the tested handler.