Added comment to why a channel is taking a channel.

batchconsumer/batchermanager.go

@@ -46,6 +46,7 @@ func newBatcherManager(
 		batchMsg:      make(chan tagMsgPair),
 		lastIgnored:   make(chan kcl.SequencePair),
 		lastProcessed: make(chan kcl.SequencePair),
+		// shutdown chan takes "done" channel to signal when batchermanager is done shutting down
 		shutdown: make(chan chan<- struct{}),
 	}
 

batchconsumer/checkpointmanager.go

@@ -15,6 +15,7 @@ type checkpointManager struct {
 	checkpointFreq time.Duration
 
 	checkpoint chan kcl.SequencePair
+	// shutdown chan takes "done" channel to signal when checkpointManager is done shutting down
 	shutdown chan chan<- struct{}
 }