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

CHANGELOG.md

@@ -52,9 +52,10 @@ Main (unreleased)
 
 - Use a forked `github.com/goccy/go-json` module which reduces the memory consumption of an Alloy instance by 20MB.
   If Alloy is running certain otelcol components, this reduction will not apply. (@ptodev)
-  
+- improve performance in regexp component: call fmt only if debug is enabled (@r0ka)
 - Update `prometheus.write.queue` library for performance increases in cpu. (@mattdurham)
 
+
 ### Bugfixes
 
 - Fixed issue with reloading configuration and prometheus metrics duplication in `prometheus.write.queue`. (@mattdurham)

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

@@ -112,7 +112,9 @@
 			extracted[name] = match[i]
 		}
 	}
-	level.Debug(r.logger).Log("msg", "extracted data debug in regex stage", "extracted data", fmt.Sprintf("%v", extracted))
+    if level.Debug(r.logger).Enabled() {
+      level.Debug(r.logger).Log("msg", "extracted data debug in regex stage", "extracted data", fmt.Sprintf("%v", extracted))
+    }
 }
 
 // Name implements Stage