JSON log format

[jelovirt]

Description

Document strucutured log (JSON).

Fields in every log message

• level — log level FATAL, ERROR, WARN, INFO, DEBUG, or TRACE
• timestamp — message timestamp in ISO datatime format

Optional fields that are in some messages depending on message type

• code — message ID
• duration — duration of build/target/task in milliseconds
• line — line number in the source document
• location — source document that caused the log message
• msg — message text
• row — row number in the source document
• stacktrace — error Java stack trace
• target — Ant target name
• task — Ant task name

Motivation and Context

Documents dita-ot/dita-ot#4581

How Has This Been Tested?

Type of Changes

• New feature (non-breaking change which adds functionality)

[infotexture]

Looks like a good start, with a few minor suggestions.

Not sure we need the list of fields in the command overview, but probably makes sense to add those to the logging topic and Xref there from the args topic.