More TODO

Author: tejasd

firebase-perf/src/main/java/com/google/firebase/perf/session/gauges/GaugeManager.java

@@ -136,6 +136,7 @@ public void startCollectingGauges(
     final String sessionIdForScheduledTask = sessionId;
     final ApplicationProcessState applicationProcessStateForScheduledTask = applicationProcessState;
 
+    // TODO(b/394127311): Switch to using AQS.
     try {
       gaugeManagerDataCollectionJob =
           gaugeManagerExecutor