feat: add config to truncate long log content (#2767)

core/logx/vars.go

@@ -16,13 +16,13 @@ const (
 const (
 	jsonEncodingType = iota
 	plainEncodingType
-
-	plainEncoding    = "plain"
-	plainEncodingSep = '\t'
-	sizeRotationRule = "size"
 )
 
 const (
+	plainEncoding    = "plain"
+	plainEncodingSep = '\t'
+	sizeRotationRule = "size"
+
 	accessFilename = "access.log"
 	errorFilename  = "error.log"
 	severeFilename = "severe.log"
@@ -53,6 +53,7 @@ const (
 	spanKey      = "span"
 	timestampKey = "@timestamp"
 	traceKey     = "trace"
+	truncatedKey = "truncated"
 )
 
 var (
@@ -60,4 +61,6 @@ var (
 	ErrLogPathNotSet = errors.New("log path must be set")
 	// ErrLogServiceNameNotSet is an error that indicates that the service name is not set.
 	ErrLogServiceNameNotSet = errors.New("log service name must be set")
+
+	truncatedField = Field(truncatedKey, true)
 )