Tracing messages

Basic and full tracing levels output different amounts of information in trace messages.

Table: Tracing message contents

Trace level	Message contents
Basic	[date_time] [thread ID] [level code] message
Full	[date_time] [thread ID] [level code] [internal function name] message
Debug	[date_time] [thread ID] [level code] [key] [internal function name] message

Any timestamp that appears in a tracing message is in UTC time, not local time. The letters UTC appear after the timestamp in the tracing message.