RAC DATABASE : Detect node eviction

Hello,

  We have on our Production cluster : 4 nodes, 4 rac databses (11.2.0.4.0)  ,  an instance has been evicted and restart.

in alert log :

Tue Oct 21 02:16:16 2014

LMD0 (ospid: 45076) received an instance eviction notification from instance 1 [2]

Tue Oct 21 02:16:16 2014

LMON received an instance eviction notification from instance 1

I need to know if we can (and how) simply detect this incident,  and send email.. :

• Cron every 5min,  parse every alert log ( 4x4 file) and grep ‘eviction’
• Use adrci or query on database like ( on GV$...) How  ?
• please suggest if you have another way ?

Regards