Switch port PoE use is one of the things we report for our customers. Use this call https://developer.cisco.com/meraki/api-v1/#!get-device-switch-ports-statuses Port PoE usage is reported as Watt-hours consumed over the timespan specified when making the call. So if you want average power usage over period T, set the timespan to T and normalise to Watts by Wh/T (with T in hours). Note that this call doesn't use a t1 parameter, so whether you use t0 or timespan it will always return data looking back from the time of the call. I just run it daily at the same time to build up long term stats. Afaik switch PoE budgets still aren't visible, but it's simple enough to use a look-up table, just need to remember to add new switches to the table when they are released.
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