diff --git a/artifacts/flagger/crd.yaml b/artifacts/flagger/crd.yaml
index d95bfc246..c4824bbb3 100644
--- a/artifacts/flagger/crd.yaml
+++ b/artifacts/flagger/crd.yaml
@@ -806,6 +806,9 @@ spec:
                                 - PASSTHROUGH
                                 - LEAST_REQUEST
                               type: string
+                            warmupDurationSecs:
+                              description: Represents the warmup duration of Service.
+                              type: string
                         outlierDetection:
                           description: Settings controlling eviction of unhealthy hosts from the load balancing pool.
                           type: object
diff --git a/charts/flagger/crds/crd.yaml b/charts/flagger/crds/crd.yaml
index d95bfc246..c4824bbb3 100644
--- a/charts/flagger/crds/crd.yaml
+++ b/charts/flagger/crds/crd.yaml
@@ -806,6 +806,9 @@ spec:
                                 - PASSTHROUGH
                                 - LEAST_REQUEST
                               type: string
+                            warmupDurationSecs:
+                              description: Represents the warmup duration of Service.
+                              type: string
                         outlierDetection:
                           description: Settings controlling eviction of unhealthy hosts from the load balancing pool.
                           type: object
diff --git a/kustomize/base/flagger/crd.yaml b/kustomize/base/flagger/crd.yaml
index d95bfc246..c4824bbb3 100644
--- a/kustomize/base/flagger/crd.yaml
+++ b/kustomize/base/flagger/crd.yaml
@@ -806,6 +806,9 @@ spec:
                                 - PASSTHROUGH
                                 - LEAST_REQUEST
                               type: string
+                            warmupDurationSecs:
+                              description: Represents the warmup duration of Service.
+                              type: string
                         outlierDetection:
                           description: Settings controlling eviction of unhealthy hosts from the load balancing pool.
                           type: object
diff --git a/pkg/apis/istio/v1alpha3/destination_rule.go b/pkg/apis/istio/v1alpha3/destination_rule.go
index e9e9a761b..16c390f60 100644
--- a/pkg/apis/istio/v1alpha3/destination_rule.go
+++ b/pkg/apis/istio/v1alpha3/destination_rule.go
@@ -255,6 +255,15 @@ type LoadBalancerSettings struct {
 	// Locality load balancer settings, this will override mesh wide settings in entirety, meaning no merging would be performed
 	// between this object and the object one in MeshConfig
 	LocalityLbSetting *LocalityLbSetting `json:"localityLbSetting,omitempty"`
+	// Represents the warmup duration of Service. If set, the newly created endpoint of service
+	// remains in warmup mode starting from its creation time for the duration of this window and
+	// Istio progressively increases amount of traffic for that endpoint instead of sending proportional amount of traffic.
+	// This should be enabled for services that require warm up time to serve full production load with reasonable latency.
+	// Please note that this is most effective when few new endpoints come up like scale event in Kubernetes. When all the
+	// endpoints are relatively new like new deployment, this is not very effective as all endpoints end up getting same
+	// amount of requests.
+	// Currently this is only supported for ROUND_ROBIN and LEAST_REQUEST load balancers.
+	WarmupDurationSecs string `json:"warmupDurationSecs,omitempty"`
 }
 
 // Locality-weighted load balancing allows administrators to control the