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Are you referring to online document TalendHelpCenter: Stats & Logs.
It is unnecessary to check out job setting Stats & Logs if you have already set this in project setting which works on the whole studio.
But you can set context in Stats & Logs of Job Setting instead of Project Setting.
I am already certified in TOS 5.3 and Talend Enterprise Data Integration 5.3 and now i'm preparing to get certified in Big Data 5.3.
I'm talking about the Talend Enterprise Data Integration Docs, Module 1 (In the On-Demand course).