feat: labels map en config (role) → extra_label en métricas + stream labels en logs

logs.go

@@ -159,7 +159,7 @@ func shipJournald(ctx context.Context, cfg Config, binPath string) {
 				ts[i] = it.ts
 				ln[i] = it.line
 			}
-			labels := map[string]string{"instance": cfg.Node, "job": "journald", "unit": unit}
+			labels := cfg.extraLabels(map[string]string{"job": "journald", "unit": unit})
 			if err := infra.PushLokiStream(cfg.LokiURL, cfg.User, cfg.Pass, labels, ts, ln); err != nil {
 				log.Printf("logs: push error (unit=%s, %d lines): %v", unit, len(items), err)
 			}
@@ -195,7 +195,7 @@ func shipFileTail(ctx context.Context, cfg Config, path, job string) {
 	if fi, err := os.Stat(path); err == nil {
 		offset = fi.Size() // skip pre-existing history on first start
 	}
-	labels := map[string]string{"instance": cfg.Node, "job": job}
+	labels := cfg.extraLabels(map[string]string{"job": job})
 
 	ticker := time.NewTicker(3 * time.Second)
 	defer ticker.Stop()