chore: version 1.0.7 - add log levels

- Add configurable log levels: DEBUG, INFO, WARN, ERROR
- Replace debug.enabled with log.level in configuration
- Add Warn/Warnf methods for warning messages
- Log orphan events and buffer overflow as WARN
- Log parse errors as WARN
- Log raw events and correlations as DEBUG

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

internal/config/config.go

@@ -12,9 +12,23 @@ import (
 
 // Config holds the complete application configuration.
 type Config struct {
-	Inputs      InputsConfig      `yaml:"inputs"`
-	Outputs     OutputsConfig     `yaml:"outputs"`
-	Correlation CorrelationConfig `yaml:"correlation"`
+	Log         LogConfig           `yaml:"log"`
+	Inputs      InputsConfig        `yaml:"inputs"`
+	Outputs     OutputsConfig       `yaml:"outputs"`
+	Correlation CorrelationConfig   `yaml:"correlation"`
+}
+
+// LogConfig holds logging configuration.
+type LogConfig struct {
+	Level string `yaml:"level"` // DEBUG, INFO, WARN, ERROR
+}
+
+// GetLogLevel returns the log level, defaulting to INFO if not set.
+func (c *LogConfig) GetLevel() string {
+	if c.Level == "" {
+		return "INFO"
+	}
+	return strings.ToUpper(c.Level)
 }
 
 // ServiceConfig holds service-level configuration.
@@ -97,6 +111,9 @@ func Load(path string) (*Config, error) {
 // defaultConfig returns a Config with default values.
 func defaultConfig() *Config {
 	return &Config{
+		Log: LogConfig{
+			Level: "INFO",
+		},
 		Inputs: InputsConfig{
 			UnixSockets: make([]UnixSocketConfig, 0),
 		},