fix: emit valid logfmt key (#3495)

* Fix log keys to be valid for logfmt

* Add changelog

Author: kalleep

CHANGELOG.md

@@ -55,6 +55,8 @@ Main (unreleased)
 
 - Fix deadlock in `loki.source.file` that can happen when targets are removed. (@kalleep)
 
+- Fix `loki.process` to emit valid logfmt. (@kalleep)
+
 ### Other changes
 
 - Update the zap logging adapter used by `otelcol` components to log arrays and objects. (@dehaansa)

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

@@ -107,7 +107,7 @@ func (m *eventLogMessageStage) processEntry(extracted map[string]interface{}, ke
 	}
 	if Debug {
 		level.Debug(m.logger).Log("msg", "extracted data debug in event_log_message stage",
-			"extracted data", fmt.Sprintf("%v", extracted))
+			"extracted_data", fmt.Sprintf("%v", extracted))
 	}
 	return nil
 }

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

@@ -165,7 +165,7 @@ func (j *jsonStage) processEntry(extracted map[string]interface{}, entry *string
 		}
 	}
 	if Debug {
-		level.Debug(j.logger).Log("msg", "extracted data debug in json stage", "extracted data", fmt.Sprintf("%v", extracted))
+		level.Debug(j.logger).Log("msg", "extracted data debug in json stage", "extracted_data", fmt.Sprintf("%v", extracted))
 	}
 	return nil
 }

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

@@ -125,7 +125,7 @@ func (r *replaceStage) Process(labels model.LabelSet, extracted map[string]inter
 			}
 		}
 	}
-	level.Debug(r.logger).Log("msg", "extracted data debug in replace stage", "extracted data", fmt.Sprintf("%v", extracted))
+	level.Debug(r.logger).Log("msg", "extracted data debug in replace stage", "extracted_data", fmt.Sprintf("%v", extracted))
 }
 
 func (r *replaceStage) getReplacedEntry(matchAllIndex [][]int, input string, td map[string]string, templ *template.Template) (string, map[string]string, error) {