Try adding below to your search your search
|eventstats sum(last_hour) as last_hour_sum by partnerId Also can't you change eval combo=partnerId."::".provider_id."::".Form_Type."::".host_base_url."::".error_type
| chart dc(intuit_tid) as total_requests by combo time_bucket
| eval partnerId=mvindex(split(combo,"::"),0)
| eval provider_id=mvindex(split(combo,"::"),1)
| eval Form_Type=mvindex(split(combo,"::"),2)
| eval host_base_url=mvindex(split(combo,"::"),3)
| eval error_type=mvindex(split(combo,"::"),4) with |stats dc(intuit_tid) as total_requests by partnerId,provider_id,Form_Type,host_base_url,error_type
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