How to set up alert for lag and redo apply ?

### Monitoring script for database/service/listener 20 * * * * /dbfs/FS1/dba/scripts/rac-status/rac-mon.sh > /tmp/rac-mon 2>&1 #0 * * * * /home/oracle/runcheck.sh 2>&1 [oracle@test.com ~]$ cat /home/oracle/runcheck.sh #!/bin/bash -x export ORACLE_HOME=/u01/app/oracle/product/11.2.0.4/dbhome_1 export PATH=$PATH:$ORACLE_HOME/bin dgmgrl sys/abcd1234@orcll_prod "show database orcl" |grep -i apply >> checkresults mailx -s 'log sync status' abhutta@test.com < /home/oracle/checkresults

Add entry as below in crontab:
### Monitoring script for data guard

#0 * * * * /home/oracle/runcheck.sh 2>&1