Slight movement in Ball Joint

On my last tire rotation my mechanic mentioned I have a light play on my driver side ball joint (synergy) with about 8,100 miles on it.
I have not noticed anything driving yet, so at what point do I need to address this issue?
 
Rotational movement is 100% normal. A shifting side to side or up and down is an indication of a worn out joint. Unless your mechanic specified what he was seeing, I would say he's just trying to upsell you on work you don't need.
 
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