Lag is now monitored in bytes, we show replication lag

and applied lag

repmgr.sql

@@ -13,6 +13,6 @@ CREATE TABLE repl_status(
   last_wal_primary_location      TEXT NOT NULL,
   last_wal_standby_location      TEXT NOT NULL,
   last_wal_standby_timestamp	 TIMESTAMP WITH TIME ZONE NOT NULL,
-  lag_time                       INTERVAL NOT NULL
---  num_wal_packets                INTEGER NOT NULL
+  replication_lag                BIGINT NOT NULL,
+  apply_lag                      BIGINT NOT NULL
 );