improve regexp performance in loki.process: call fmt only if debug …

…is enabled. fix debug check

internal/component/loki/process/stages/regex.go

@@ -112,9 +112,9 @@ func (r *regexStage) Process(labels model.LabelSet, extracted map[string]interfa
 			extracted[name] = match[i]
 		}
 	}
-    if isDebugEnabled(r.logger) {
-      level.Debug(r.logger).Log("msg", "extracted data debug in regex stage", "extracted data", fmt.Sprintf("%v", extracted))
-    }
+	if isDebugEnabled(r.logger) {
+		level.Debug(r.logger).Log("msg", "extracted data debug in regex stage", "extracted data", fmt.Sprintf("%v", extracted))
+	}
 }
 
 // Name implements Stage
@@ -123,5 +123,5 @@ func (r *regexStage) Name() string {
 }
 
 func isDebugEnabled(logger log.Logger) bool {
-    return level.Debug(logger).Enabled()
+	return level.AllowDebug().Enabled(logger)
 }