You could try this to get the fields you're looking for:
| rest /servicesNS/nobody/SA-ITOA/itoa_interface/kpi_base_search
| eval value=spath(value,"{}")
| mvexpand value
| eval base_search = spath(value, "base_search")
| eval title = spath(value, "title")
| eval metric_titles=spath(value, "metrics{}.title")
| eval threshold_fields=spath(value, "metrics{}.threshold_field")
| eval entity_calculation=spath(value, "metrics{}.entity_statop")
| eval service_calculation=spath(value, "metrics{}.aggregate_statop")
| eval units=spath(value, "metrics{}.unit")
| fields title, base_search, metric_titles, threshold_fields, entity_calculation, service_calculation, units
Alternately you could rework the above search so each row contains all elements of the metric you're interested in.
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