diff --git a/test/instrumentation/decode_metric.go b/test/instrumentation/decode_metric.go
index 81bb878c4b3..2100e3cd6b3 100644
--- a/test/instrumentation/decode_metric.go
+++ b/test/instrumentation/decode_metric.go
@@ -24,6 +24,7 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+	"time"
 
 	"k8s.io/component-base/metrics"
 )
@@ -70,7 +71,7 @@ func (c *metricDecoder) decodeNewMetricCall(fc *ast.CallExpr) (*metric, error) {
 		return nil, nil
 	}
 	switch functionName {
-	case "NewCounter", "NewGauge", "NewHistogram", "NewSummary", "NewTimingHistogram":
+	case "NewCounter", "NewGauge", "NewHistogram", "NewSummary", "NewTimingHistogram", "NewGaugeFunc":
 		m, err = c.decodeMetric(fc)
 	case "NewCounterVec", "NewGaugeVec", "NewHistogramVec", "NewSummaryVec", "NewTimingHistogramVec":
 		m, err = c.decodeMetricVec(fc)
@@ -90,7 +91,7 @@ func getMetricType(functionName string) string {
 	switch functionName {
 	case "NewCounter", "NewCounterVec":
 		return counterMetricType
-	case "NewGauge", "NewGaugeVec":
+	case "NewGauge", "NewGaugeVec", "NewGaugeFunc":
 		return gaugeMetricType
 	case "NewHistogram", "NewHistogramVec":
 		return histogramMetricType
@@ -104,7 +105,7 @@ func getMetricType(functionName string) string {
 }
 
 func (c *metricDecoder) decodeMetric(call *ast.CallExpr) (metric, error) {
-	if len(call.Args) != 1 {
+	if len(call.Args) > 2 {
 		return metric{}, newDecodeErrorf(call, errInvalidNewMetricCall)
 	}
 	return c.decodeOpts(call.Args[0])
@@ -326,7 +327,6 @@ func (c *metricDecoder) decodeOpts(expr ast.Expr) (metric, error) {
 		case "MaxAge":
 			int64Val, err := c.decodeInt64(kv.Value)
 			if err != nil {
-				print(key)
 				return m, err
 			}
 			m.MaxAge = int64Val
@@ -462,16 +462,64 @@ func (c *metricDecoder) decodeInt64(expr ast.Expr) (int64, error) {
 				return 1000 * 1000 * 1000 * 60 * 10, nil
 			}
 		}
+	case *ast.Ident:
+		variableExpr, found := c.variables[v.Name]
+		if found {
+			be, ok := variableExpr.(*ast.BinaryExpr)
+			if ok {
+				i, err2, done := c.extractTimeExpression(be)
+				if done {
+					return i, err2
+				}
+			}
+
+		}
+
 	case *ast.CallExpr:
 		_, ok := v.Fun.(*ast.SelectorExpr)
 		if !ok {
 			return 0, newDecodeErrorf(v, errDecodeInt64)
 		}
 		return 0, nil
+	case *ast.BinaryExpr:
+		i, err2, done := c.extractTimeExpression(v)
+		if done {
+			return i, err2
+		}
 	}
 	return 0, newDecodeErrorf(expr, errDecodeInt64)
 }
 
+func (c *metricDecoder) extractTimeExpression(v *ast.BinaryExpr) (int64, error, bool) {
+	x := v.X.(*ast.BasicLit)
+	if x.Kind != token.FLOAT && x.Kind != token.INT {
+		print(x.Kind)
+	}
+
+	xValue, err := strconv.ParseInt(x.Value, 10, 64)
+	if err != nil {
+		return 0, err, true
+	}
+
+	switch y := v.Y.(type) {
+	case *ast.SelectorExpr:
+		variableName := y.Sel.String()
+		importName, ok := y.X.(*ast.Ident)
+		if ok && importName.String() == "time" {
+			if variableName == "Hour" {
+				return xValue * int64(time.Hour), nil, true
+			}
+			if variableName == "Minute" {
+				return xValue * int64(time.Minute), nil, true
+			}
+			if variableName == "Second" {
+				return xValue * int64(time.Second), nil, true
+			}
+		}
+	}
+	return 0, nil, false
+}
+
 func decodeFloatMap(exprs []ast.Expr) (map[float64]float64, error) {
 	buckets := map[float64]float64{}
 	for _, elt := range exprs {
diff --git a/test/instrumentation/find_stable_metric.go b/test/instrumentation/find_stable_metric.go
index 03605017946..41d3b23a610 100644
--- a/test/instrumentation/find_stable_metric.go
+++ b/test/instrumentation/find_stable_metric.go
@@ -29,6 +29,7 @@ var metricsOptionStructuresNames = []string{
 	"GaugeOpts",
 	"HistogramOpts",
 	"SummaryOpts",
+	"TimingHistogramOpts",
 }
 
 func findStableMetricDeclaration(tree ast.Node, metricsImportName string) ([]*ast.CallExpr, []error) {
@@ -98,7 +99,7 @@ func (f *stableMetricFinder) Visit(node ast.Node) (w ast.Visitor) {
 func isMetricOps(name string) bool {
 	var found = false
 	for _, optsName := range metricsOptionStructuresNames {
-		if name != optsName {
+		if name == optsName {
 			found = true
 			break
 		}
diff --git a/test/instrumentation/testdata/pkg/kubelet/metrics/metrics.go b/test/instrumentation/testdata/pkg/kubelet/metrics/metrics.go
index 45bbe077938..5a8181c6ab5 100644
--- a/test/instrumentation/testdata/pkg/kubelet/metrics/metrics.go
+++ b/test/instrumentation/testdata/pkg/kubelet/metrics/metrics.go
@@ -77,6 +77,8 @@ var (
 	defObjectives = map[float64]float64{0.5: 0.5, 0.75: 0.75}
 	testBuckets   = []float64{0, 0.5, 1.0}
 	testLabels    = []string{"a", "b", "c"}
+	maxAge        = 2 * time.Minute
+
 	// NodeName is a Gauge that tracks the ode's name. The count is always 1.
 	NodeName = metrics.NewGaugeVec(
 		&metrics.GaugeOpts{
@@ -109,6 +111,29 @@ var (
 		},
 		testLabels,
 	)
+	// PodWorkerDuration is a Histogram that tracks the duration (in seconds) in takes to sync a single pod.
+	// Broken down by the operation type.
+	SummaryMaxAge = metrics.NewSummary(
+		&metrics.SummaryOpts{
+			Subsystem:      KubeletSubsystem,
+			Name:           "max_age",
+			Help:           "Duration in seconds to sync a single pod. Broken down by operation type: create, update, or sync",
+			StabilityLevel: metrics.BETA,
+			MaxAge:         2 * time.Hour,
+		},
+	)
+
+	// PodWorkerDuration is a Histogram that tracks the duration (in seconds) in takes to sync a single pod.
+	// Broken down by the operation type.
+	SummaryMaxAgeConst = metrics.NewSummary(
+		&metrics.SummaryOpts{
+			Subsystem:      KubeletSubsystem,
+			Name:           "max_age_const",
+			Help:           "Duration in seconds to sync a single pod. Broken down by operation type: create, update, or sync",
+			StabilityLevel: metrics.BETA,
+			MaxAge:         maxAge,
+		},
+	)
 	// PodStartDuration is a Histogram that tracks the duration (in seconds) it takes for a single pod to go from pending to running.
 	PodStartDuration = metrics.NewHistogram(
 		&metrics.HistogramOpts{
@@ -481,6 +506,26 @@ func Register(collectors ...metrics.StableCollector) {
 		for _, collector := range collectors {
 			legacyregistry.CustomMustRegister(collector)
 		}
+		legacyregistry.RawMustRegister(metrics.NewGaugeFunc(
+			&metrics.GaugeOpts{
+				Subsystem: "kubelet",
+				Name:      "certificate_manager_client_ttl_seconds",
+				Help: "Gauge of the TTL (time-to-live) of the Kubelet's client certificate. " +
+					"The value is in seconds until certificate expiry (negative if already expired). " +
+					"If client certificate is invalid or unused, the value will be +INF.",
+				StabilityLevel: metrics.BETA,
+			},
+			func() float64 {
+				return 0
+			},
+		))
+		_ = metrics.Labels{
+			"probe_type": "1",
+			"container":  "2",
+			"pod":        "podName",
+			"namespace":  "space",
+			"pod_uid":    "123",
+		}
 	})
 }
 
diff --git a/test/instrumentation/testdata/test-stable-metrics-list.yaml b/test/instrumentation/testdata/test-stable-metrics-list.yaml
index 4fbe7ee07c1..d6cc66b59aa 100644
--- a/test/instrumentation/testdata/test-stable-metrics-list.yaml
+++ b/test/instrumentation/testdata/test-stable-metrics-list.yaml
@@ -1,3 +1,10 @@
+- name: certificate_manager_client_ttl_seconds
+  subsystem: kubelet
+  help: Gauge of the TTL (time-to-live) of the Kubelet's client certificate. The value
+    is in seconds until certificate expiry (negative if already expired). If client
+    certificate is invalid or unused, the value will be +INF.
+  type: Gauge
+  stabilityLevel: BETA
 - name: device_plugin_alloc_duration_seconds
   subsystem: kubelet
   help: Duration in seconds to serve a device plugin Allocation request. Broken down
@@ -18,6 +25,20 @@
   - 2.5
   - 5
   - 10
+- name: max_age
+  subsystem: kubelet
+  help: 'Duration in seconds to sync a single pod. Broken down by operation type:
+    create, update, or sync'
+  type: Summary
+  stabilityLevel: BETA
+  maxAge: 7200000000000
+- name: max_age_const
+  subsystem: kubelet
+  help: 'Duration in seconds to sync a single pod. Broken down by operation type:
+    create, update, or sync'
+  type: Summary
+  stabilityLevel: BETA
+  maxAge: 120000000000
 - name: multiline
   subsystem: kubelet
   help: Cumulative number of pod preemptions by preemption resource asdf asdf asdf