feat: address review comments

cmd/collectors/restperf/restperf.go

@@ -1441,7 +1441,7 @@ func (r *RestPerf) pollInstance(records []gjson.Result, apiD time.Duration) (map
 			// The API endpoint api/storage/qos/workloads lacks an is_constituent filter, unlike qos-workload-get-iter. As a result, we must perform client-side filtering.
 			// Although the api/private/cli/qos/workload endpoint includes this filter, it doesn't provide an option to fetch all records, both constituent and flexgroup types.
 			if r.perfProp.disableConstituents {
-				if match := constituentRegex.FindStringSubmatch(instanceData.Get("volume").String()); len(match) == 3 {
+				if constituentRegex.MatchString(instanceData.Get("volume").String()) {
 					// skip constituent
 					continue
 				}