Output with default logger level:
Output 1 with INFO logger level.
Output 1 with WARN logger level.
Output 1 with ERROR logger level.
Current logger level: 0
Output with debug logger level:
Output 2 with DEBUG logger level.
Output 2 with INFO logger level.
Output 2 with WARN logger level.
Output 2 with ERROR logger level.
Current logger level: 10
Output with warn logger level:
Output 3 with WARN logger level.
Output 3 with ERROR logger level.
Current logger level: 30
Output with error logger level:
Output 4 with ERROR logger level.
Current logger level: 40
