David Lang's series of articles on logging topics, published in ;login:, are available below.
Enterprise Logging
;login: vol. 38, no. 4, August, 2013
Log Filtering with Rsyslog
;login: vol. 38, no. 5, October, 2013
Using SEC
;login: vol. 38, no. 6, December, 2013
Logging Reports and Dashboards
;login: vol. 39, no. 1, February, 2014