Where can I find BGP Debug logs

General questions
1

Hi Team,

Where can I find the BGP debug logs? or how do I enable BGP debugging to troubleshoot the issue? This is 1.2.8

2 
monitor protocol bgp enable allow-martians
monitor protocol bgp enable neighbor-events
monitor protocol bgp enable updates

monitor protocol bgp
And:

cat /var/log/messages | grep bgp