If youre not wanting to use the MC, you can easily take the searches out of the MC, and customize them to what you are looking for. The dash boards in the MC are meant to help understand, and to an extent, manage your distributed Splunk environment. There is plenty in there about SH, but your biggest points to monitor would be CPU, RAM, and search concurrency.
Adapting these prebuilt searches out of the MC would be easiest. Aside from this, you could look at the deprecated SoS App (Splunk on Splunk.) However, most of the searches used in that app were all adapted and put into the MC.
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