In the bad old days when dial-up was king, I worked for a regional ISP that used MRTG to keep track of call volume trends on its Ascend access servers. The concept of a network management system intrigued me, and in my next job as a contractor for a civilian US government agency I took the reins of an installation of what was then called Concord Network Health.
Concord evidently figured that I "got it" and hired me away in late 2000 to work for their professional services division. After a year of nearly constant travel I jumped to the software engineering side of Concord as a way to spend more time writing code and less time on the road. My work there focused on the system and application management products of the eHealth suite, namely AdvantEDGE View, SystemEDGE, and Service Availability. These products came from the portfolio of Empire Technologies which Concord had acquired in 1999. Computer Associates acquired Concord in mid-2005; my employment at CA ended in August 2005