fix comments for exposeManagedLedgerMetricsInPrometheus field
@@ -1395,7 +1395,7 @@ metricsBufferResponse=false
# Enable producer level metrics. default is false
exposeProducerLevelMetricsInPrometheus=false
-# Enable managed ledger metrics (aggregated by namespace). default is false
+# Enable managed ledger metrics (aggregated by namespace). default is true
exposeManagedLedgerMetricsInPrometheus=true
# Enable cursor level metrics. default is false
