Custom Log Levels

Add your own log levels with custom priorities and colors.

Overview

Beyond the 8 built-in levels, you can create custom levels for specific use cases.

Adding Custom Levels

#![allow(unused)]
fn main() {
use logly::prelude::*;

let logger = Logger::new();
logger.add_sink(SinkConfig::default())?;

// Add custom level: name, priority, ANSI color code
logger.add_custom_level("NOTICE".to_string(), 35, "96".to_string())?;
logger.add_custom_level("AUDIT".to_string(), 42, "95".to_string())?;
}

Using Custom Levels

#![allow(unused)]
fn main() {
logger.log_custom("NOTICE", "Important notice".to_string())?;
logger.log_custom("AUDIT", "Security audit log".to_string())?;
}

Priority System

Custom levels fit into the priority hierarchy:

ANSI Color Codes

Common color codes:

• 30 - Black
• 31 - Red
• 32 - Green
• 33 - Yellow
• 34 - Blue
• 35 - Magenta
• 36 - Cyan
• 37 - White
• 90-97 - Bright colors

Examples

Security Audit Level

#![allow(unused)]
fn main() {
logger.add_custom_level("AUDIT".to_string(), 42, "95".to_string())?;
logger.log_custom("AUDIT", "User login attempt".to_string())?;
}

Performance Metrics

#![allow(unused)]
fn main() {
logger.add_custom_level("METRIC".to_string(), 15, "36".to_string())?;
logger.log_custom("METRIC", "Response time: 45ms".to_string())?;
}

Business Events

#![allow(unused)]
fn main() {
logger.add_custom_level("BUSINESS".to_string(), 28, "33".to_string())?;
logger.log_custom("BUSINESS", "Order placed: $99.99".to_string())?;
}

See Also

• Log Levels
• Formatting