Tenant created workorder - Cracks on the wall

[Mayank S.]

My tenant just shared the pictures with my PM about a crack on the wall which has increased over the past four days. My PM in turn has forwarded me the pictures and asking me what action would I prefer them to take. Attached are the pictures. I don't have much of a clue really what should my next step be? I see these type of cracks at my house too and never concerned me. May be it's nothing...However would appreciate to hear from seasoned landlords/PMs/REIs on my next step. 

Any advise is appreciated.