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API Services - unusable aggregate metrics

Hello,
I have connected OCUM/OCPM to API Services hoping I will be able to get a reasonable performance data. 

Unfortunately I don't see a way to pull performance data average for a given amount of time (at least few hours). 

Especially the current_used_headroom counter fluctuates heavily changing from 1 to 95 in few seconds. 


The idea was to get "some" performance indicator (performance headroom being one of the best I think) to select best node/aggregate to provision new storage. 

Is there a way to do it with API Services or I need to switch to good old ZAPI ?