Inwhatevercomputingenvironmentanorganizationchoosestodeployanapplication,theorganizationwillneedsomeevidencethattheapplicationisrunningasintended.Thisevidenceservesboththeorganization'sownassurancesandthoseofauditorsorcustomers.Evenifnomaliceisinvolved,theenvironment'soptimizationsmayonlyapproximatetheintendedresult.Amulti-tenantcomputingenvironmentsuchasapubliccloudhostingVPCsformultipleorganizationsintroducesfurthercomplexities.AswithanyInternetservice,tenantsareaffectedbyoneanother'sbehavior,whichcanbeunpredictable.Becausethereisnodirectopportunityfornegotiationamongdifferenttenantswithrespecttotheunderlyingcomputingenvironment(inprinciple,theycannotevendetectoneanother),anycontentionmustberesolvedbythecloudprovideritself.