Motivation

Router currently supports the log-levels:

• error
• warning
• info
• debug

It's often desirable for a user to limit the amount of logging from an application even when logging on a sensible normal loglevel.

Normally, the currently available loglevels "error" and "warning" produce very little log, while "debug" produces excessive amounts of logging, in this respect.

On the other side, there is a need to log certain messages all the time that aren't errors. E.g. state-changes like:

• startup
• shutdown

Background: mysql-server

The mysql-server supports:

• system
• error
• warning
• note

Goal

• Add new "system" loglevel which is higher than "error"
• Add new "note" loglevel which is between "info" and "debug"

FR1

loglevel note and system MUST be settable through existing loglevel specification mechanisms in Router

FR2

loglevel note MUST log only system, error, info and note messages

FR3

loglevel system MUST log only system messages

Configuration

log_level accepts new log-levels: system and note.

API

To log the new log-message types, two new log-functions are added to the mysql/harness/logging/logging.h header:

• log_system(...)
• log_note(...)