feat(observabillity): #115 integrate otel for metrics and traces

internal/handler/middleware/gzip.go

@@ -34,7 +34,7 @@ func Gzip(next http.Handler) http.Handler {
 
 		err := gz.Close()
 		if err != nil && !errors.Is(err, http.ErrBodyNotAllowed) {
-			log.Error("Gzip: could not close Writer: %v", err)
+			log.L.Error("Gzip: could not close Writer", "err", err)
 		}
 	})
 }