Netapp has instructions for that at https://www.netapp.com/blog/monitoring-netapp-splunk/
The instructions are a little dated, but should be adaptable to current Splunk versions. Depending on which Splunk Cloud experience you have, you may need to define inputs on your Splunk Cloud IDM, Splunk Cloud SH, or an on-prem heavy forwarder.
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If this reply helps you, Karma would be appreciated.
