caddyhttp: Add uuid to access logs when used (#5859)

modules/caddyhttp/logging.go

@@ -151,6 +151,18 @@ func (e *ExtraLogFields) Add(field zap.Field) {
 	e.fields = append(e.fields, field)
 }
 
+// Set sets a field in the list of extra fields to log.
+// If the field already exists, it is replaced.
+func (e *ExtraLogFields) Set(field zap.Field) {
+	for i := range e.fields {
+		if e.fields[i].Key == field.Key {
+			e.fields[i] = field
+			return
+		}
+	}
+	e.fields = append(e.fields, field)
+}
+
 const (
 	// Variable name used to indicate that this request
 	// should be omitted from the access logs