Make async for loops performant using Promise.all

web/src/app/Poller.js

@@ -21,15 +21,16 @@ class Poller {
   async pollAll() {
     console.log(`[Poller] Polling all subscriptions`);
     const subscriptions = await subscriptionManager.all();
-    for (const s of subscriptions) {
-      try {
-        // TODO(eslint): Switch to Promise.all
-        // eslint-disable-next-line no-await-in-loop
-        await this.poll(s);
-      } catch (e) {
-        console.log(`[Poller] Error polling ${s.id}`, e);
-      }
-    }
+
+    await Promise.all(
+      subscriptions.map(async (s) => {
+        try {
+          await this.poll(s);
+        } catch (e) {
+          console.log(`[Poller] Error polling ${s.id}`, e);
+        }
+      })
+    );
   }
 
   async poll(subscription) {