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As much as we think to track, pretty much. Everything from avatar deaths (broken down by source) per hour to the total number of avatar moves made per hour to data on gold generation, gold movement, lesson use, credit use, mob deaths, position on TMS, character creations, fish caught per hour, etc etc etc. You're not tracking enough until you simply cannot support the storage requirements of your logs.
Presently, we keep most data logs forever, but there are some exceptions in which a data point is only kept for a finite period of time due to the sheer amount of data in those types of logs.
Of course, just logging things isn't enough. If you don't do analyse them and react to the data presented, your logs are fairly useless. The way I look at it is that you may as well log whatever comes to mind. Some of the logs may turn out to be relatively useless, but others will be used on a near-daily basis.
--matt
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