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you can check your log in buffer :

#show logging

By default the buffer is 4k (aprox 60 lines), you can change it with :

(config)#logging buffered 23456

Remove logging to console :

(config)#no logging console

Disable specific logging in the buffer :

(config)#logging discriminator nologthr msg-body drops string_or_regexp_to_match 
(config)#logging buffered discriminator nologthr

To only have notifications (level 5) and more important logs :

(config)#logging buffered 40960 notifications

Add proper time format to your logs :
(config)#service timestamps log datetime localtime show-timezone

Log when someone fail (or success) to log in :

(config)#login on-failure log
(config)#login on-success log