We're not given access to memory usage or CPU usage. The closest you get is the device utilization for MX, as seen via the summary report. That said, I'm not seeing a way to get the summary report information via API? You can schedule it to send you a report via email. Regarding bandwidth, a few options: SNMP will get you whole device bandwidth and interface utilization. Cloud can send you an alert if X amount of bandwidth has crossed your Meraki network in Y time. Including via webhook.
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