superagent: retry in graphs logic to workaround node socket issue

https://github.com/nodejs/undici/issues/3492

src/graphs.js

@@ -61,7 +61,9 @@ async function getContainerStats(name, fromMinutes, noNullPoints) {
             noNullPoints: !!noNullPoints
         };
 
-        const [error, response] = await safe(superagent.get(graphiteUrl).query(query).timeout(30 * 1000).ok(() => true));
+        // the retry() is needed because there is a node/fetch bug that a closed socket is reused when making a request to the same endpoint many times
+        // https://github.com/nodejs/undici/issues/3492
+        const [error, response] = await safe(superagent.get(graphiteUrl).query(query).timeout(30 * 1000).retry(3).ok(() => true));
         if (error) throw new BoxError(BoxError.NETWORK_ERROR, error);
         if (response.status !== 200) throw new BoxError(BoxError.EXTERNAL_ERROR, `Unknown error with ${target}: ${response.status} ${response.text}`);