Instrumentation: Add status_source label to request metrics/logs (#74114)

Ref #68480

Co-authored-by: Giuseppe Guerra <giuseppe.guerra@grafana.com>

pkg/api/pluginproxy/ds_proxy.go

@@ -120,6 +120,7 @@ func (proxy *DataSourceProxy) HandleRequest() {
 				Body:          io.NopCloser(strings.NewReader(msg)),
 				ContentLength: int64(len(msg)),
 				Header:        http.Header{},
+				Request:       resp.Request,
 			}
 		}
 		return nil