diff --git a/cmd/collectors/restperf/restperf.go b/cmd/collectors/restperf/restperf.go
index 74fa003cb..feabed9d3 100644
--- a/cmd/collectors/restperf/restperf.go
+++ b/cmd/collectors/restperf/restperf.go
@@ -25,6 +25,7 @@ import (
 	"github.com/rs/zerolog"
 	"github.com/tidwall/gjson"
 	"path"
+	"regexp"
 	"strconv"
 	"strings"
 	"time"
@@ -38,6 +39,10 @@ const (
 	objWorkloadVolumeClass = "autovolume"
 )
 
+var (
+	constituentRegex = regexp.MustCompile(`^(.*)__(\d{4})$`)
+)
+
 var qosQuery = "api/cluster/counter/tables/qos"
 var qosVolumeQuery = "api/cluster/counter/tables/qos_volume"
 var qosDetailQuery = "api/cluster/counter/tables/qos_detail"
@@ -69,10 +74,11 @@ type counter struct {
 }
 
 type perfProp struct {
-	isCacheEmpty  bool
-	counterInfo   map[string]*counter
-	latencyIoReqd int
-	qosLabels     map[string]string
+	isCacheEmpty        bool
+	counterInfo         map[string]*counter
+	latencyIoReqd       int
+	qosLabels           map[string]string
+	disableConstituents bool
 }
 
 type metricResponse struct {
@@ -126,7 +132,7 @@ func (r *RestPerf) Init(a *collector.AbstractCollector) error {
 		return err
 	}
 
-	if err = r.InitQOSLabels(); err != nil {
+	if err = r.InitQOS(); err != nil {
 		return err
 	}
 
@@ -137,7 +143,7 @@ func (r *RestPerf) Init(a *collector.AbstractCollector) error {
 	return nil
 }
 
-func (r *RestPerf) InitQOSLabels() error {
+func (r *RestPerf) InitQOS() error {
 	if isWorkloadObject(r.Prop.Query) || isWorkloadDetailObject(r.Prop.Query) {
 		qosLabels := r.Params.GetChildS("qos_labels")
 		if qosLabels == nil {
@@ -155,6 +161,15 @@ func (r *RestPerf) InitQOSLabels() error {
 			r.perfProp.qosLabels[label] = display
 		}
 	}
+	if counters := r.Params.GetChildS("counters"); counters != nil {
+		refine := counters.GetChildS("refine")
+		if refine != nil {
+			withConstituents := refine.GetChildContentS("with_constituents")
+			if withConstituents == "false" {
+				r.perfProp.disableConstituents = true
+			}
+		}
+	}
 	return nil
 }
 
@@ -1411,6 +1426,7 @@ func (r *RestPerf) pollInstance(records []gjson.Result, apiD time.Duration) (map
 	if len(records) == 0 {
 		return nil, errs.New(errs.ErrNoInstance, "no "+r.Object+" instances on cluster")
 	}
+
 	for _, instanceData := range records {
 		var (
 			instanceKey string
@@ -1421,6 +1437,17 @@ func (r *RestPerf) pollInstance(records []gjson.Result, apiD time.Duration) (map
 			continue
 		}
 
+		if isWorkloadObject(r.Prop.Query) || isWorkloadDetailObject(r.Prop.Query) {
+			// 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 constituentRegex.MatchString(instanceData.Get("volume").String()) {
+					// skip constituent
+					continue
+				}
+			}
+		}
+
 		// extract instance key(s)
 		for _, k := range instanceKeys {
 			var value gjson.Result
diff --git a/cmd/collectors/zapiperf/zapiperf.go b/cmd/collectors/zapiperf/zapiperf.go
index fce2295df..7d0156159 100644
--- a/cmd/collectors/zapiperf/zapiperf.go
+++ b/cmd/collectors/zapiperf/zapiperf.go
@@ -282,7 +282,9 @@ func (z *ZapiPerf) loadWorkloadClassQuery(defaultValue string) string {
 
 func (z *ZapiPerf) updateWorkloadQuery(query *node.Node) {
 	// filter -> workload-class takes precedence over workload_class param at root level
+	// filter -> is-constituent takes precedence over refine -> with_constituents
 	workloadClass := ""
+	isConstituent := ""
 	counters := z.Params.GetChildS("counters")
 	if counters != nil {
 		filter := counters.GetChildS("filter")
@@ -294,20 +296,32 @@ func (z *ZapiPerf) updateWorkloadQuery(query *node.Node) {
 				if name == "workload-class" {
 					workloadClass = content
 				}
+				if name == "is-constituent" {
+					isConstituent = content
+				}
 			}
 		}
 	}
-	if workloadClass != "" {
-		return
+	if workloadClass == "" {
+		var workloadClassQuery string
+		if z.Query == objWorkloadVolume || z.Query == objWorkloadDetailVolume {
+			workloadClassQuery = z.loadWorkloadClassQuery(objWorkloadVolumeClass)
+		} else {
+			workloadClassQuery = z.loadWorkloadClassQuery(objWorkloadClass)
+		}
+		query.NewChildS("workload-class", workloadClassQuery)
 	}
-
-	var workloadClassQuery string
-	if z.Query == objWorkloadVolume || z.Query == objWorkloadDetailVolume {
-		workloadClassQuery = z.loadWorkloadClassQuery(objWorkloadVolumeClass)
-	} else {
-		workloadClassQuery = z.loadWorkloadClassQuery(objWorkloadClass)
+	if isConstituent == "" {
+		if counters != nil {
+			refine := counters.GetChildS("refine")
+			if refine != nil {
+				isConstituent = refine.GetChildContentS("with_constituents")
+				if isConstituent == "false" {
+					query.NewChildS("is-constituent", isConstituent)
+				}
+			}
+		}
 	}
-	query.NewChildS("workload-class", workloadClassQuery)
 }
 
 // load an int parameter or use defaultValue
diff --git a/conf/restperf/9.12.0/workload_detail.yaml b/conf/restperf/9.12.0/workload_detail.yaml
index 823e2a579..148921f5b 100644
--- a/conf/restperf/9.12.0/workload_detail.yaml
+++ b/conf/restperf/9.12.0/workload_detail.yaml
@@ -15,10 +15,11 @@ schedule:
 
 counters:
   - ^^id
-  - ^node.name      => node
   - service_time
   - visits
   - wait_time
+  - refine:
+      - with_constituents: false   # The possible values are true or false. Setting this to true will include constituents in the results, while false will exclude them.
 
 resource_map:
   CPU_dblade: backend
diff --git a/conf/restperf/9.12.0/workload_detail_volume.yaml b/conf/restperf/9.12.0/workload_detail_volume.yaml
index 0f542aada..ee48165db 100644
--- a/conf/restperf/9.12.0/workload_detail_volume.yaml
+++ b/conf/restperf/9.12.0/workload_detail_volume.yaml
@@ -17,6 +17,8 @@ counters:
   - service_time
   - visits
   - wait_time
+  - refine:
+      - with_constituents: false # The possible values are true or false. Setting this to true will include constituents in the results, while false will exclude them.
 
 resource_map:
   CPU_dblade : backend
diff --git a/conf/zapiperf/cdot/9.8.0/workload_detail.yaml b/conf/zapiperf/cdot/9.8.0/workload_detail.yaml
index 59cf7ccab..6a0ff5b33 100644
--- a/conf/zapiperf/cdot/9.8.0/workload_detail.yaml
+++ b/conf/zapiperf/cdot/9.8.0/workload_detail.yaml
@@ -21,6 +21,8 @@ counters:
   - service_time
   - visits
   - wait_time
+  - refine:
+      - with_constituents: false # The possible values are true or false. Setting this to true will include constituents in the results, while false will exclude them.
 
 resource_map:
   CPU_dblade: backend
diff --git a/conf/zapiperf/cdot/9.8.0/workload_detail_volume.yaml b/conf/zapiperf/cdot/9.8.0/workload_detail_volume.yaml
index f75c6d225..38cdf866b 100644
--- a/conf/zapiperf/cdot/9.8.0/workload_detail_volume.yaml
+++ b/conf/zapiperf/cdot/9.8.0/workload_detail_volume.yaml
@@ -20,6 +20,8 @@ counters:
   - service_time
   - visits
   - wait_time
+  - refine:
+      - with_constituents: false # The possible values are true or false. Setting this to true will include constituents in the results, while false will exclude them.
 
 resource_map:
   CPU_dblade : backend