Logging FAQ

Level

• level - importance - severity
• 日志级别有两种表示方式：
  • SeverityText
  • SeverityNumber - Priority
    • 1-100
    • 0-7
• Severity, Urgency
• Filtering
• Actionability
• Consistency
• Customization
• Extensibility

• opentelemetry.io/docs/specs/otel/logs
  • 0 unspecified
  • 每个级别 4 个数字
  • 1-4 TRACE
  • 5-8 DEBUG
  • 9-12 INFO
  • 13-16 WARN
  • 17-20 ERROR
  • 21-24 FATAL
• consola
  • -Inf silent
  • 0 error, fatal
  • 1 warn
  • 2 log
  • 3 info, success, fail, start, ready, box
  • 4 debug
  • 5 trace
  • +Inf verbose
  • unjs/consola/src/constants.ts
• Log4j
  • Name - Priority
  • OFF 0
  • FATAL 100
  • ERROR 200
  • WARN 300
  • INFO 400
  • DEBUG 500
  • TRACE 600
  • ALL Integer.MAX_VALUE
• zap
  • uber-go/zap/zapcore/level.go
  • dpanic - 开发模式下 panic - 有点类似于 assert

• silent
• fatal
• error
  • panic
  • critical
• warn
  • warning
• log
• info
  • success
  • fail
  • start
  • ready
• debug
• trace
• verbose

/*
Bunyan
 const levels = {
    FATAL: 60,
    ERROR: 50,
    WARN: 40,
    INFO: 30,
    DEBUG: 20,
    TRACE: 10
  }

  Pino
  const levels = {
    fatal: 60,
    error: 50,
    warn: 40,
    info: 30,
    debug: 20,
    trace: 10
  }
Winston
  const levels = {
    error: 0,
    warn: 1,
    info: 2,
    debug: 3
  }
Syslog RFC 3164
0 = Emergency
1 = Alert
2 = Critical
3 = Error
4 = Warning
5 = Notice
6 = Informational
7 = Debug
 */