diff --git a/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/testdata/MonoVertexRollout/rollout-running-fast.yaml b/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/testdata/MonoVertexRollout/rollout-running-fast.yaml
index 5298209fda..158eeae29b 100644
--- a/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/testdata/MonoVertexRollout/rollout-running-fast.yaml
+++ b/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/testdata/MonoVertexRollout/rollout-running-fast.yaml
@@ -15,6 +15,9 @@ metadata:
   resourceVersion: '947414'
   uid: a63f377e-1500-437e-9267-579f4a790518
 spec:
+  strategy:
+    pauseResume:
+      fastResume: true
   monoVertex:
     metadata:
       annotations:
diff --git a/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/testdata/MonoVertexRollout/rollout-running-gradual.yaml b/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/testdata/MonoVertexRollout/rollout-running-gradual.yaml
index a26c3e168f..1c86b9c819 100644
--- a/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/testdata/MonoVertexRollout/rollout-running-gradual.yaml
+++ b/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/testdata/MonoVertexRollout/rollout-running-gradual.yaml
@@ -15,12 +15,14 @@ metadata:
   resourceVersion: '947414'
   uid: a63f377e-1500-437e-9267-579f4a790518
 spec:
+  strategy:
+    pauseResume:
+      fastResume: false
   monoVertex:
     metadata:
       annotations:  
         numaflow.numaproj.io/allowed-resume-strategies: "slow, fast"
     spec:
-      replicas: null
       lifecycle:
         desiredPhase: Running
       sink:
diff --git a/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/unpause-fast/action.lua b/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/unpause-fast/action.lua
index c5aa23b690..1cbb6192f9 100644
--- a/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/unpause-fast/action.lua
+++ b/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/unpause-fast/action.lua
@@ -1,2 +1,10 @@
 obj.spec.monoVertex.spec.lifecycle.desiredPhase = "Running"
+-- set strategy.fastResume to true
+if obj.spec.strategy == nil then
+    obj.spec.strategy = {}
+end
+if obj.spec.strategy.pauseResume == nil then
+    obj.spec.strategy.pauseResume = {}
+end
+obj.spec.strategy.pauseResume.fastResume = true
 return obj
\ No newline at end of file
diff --git a/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/unpause-gradual/action.lua b/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/unpause-gradual/action.lua
index 40a4d05b55..92946fb287 100644
--- a/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/unpause-gradual/action.lua
+++ b/resource_customizations/numaplane.numaproj.io/MonoVertexRollout/actions/unpause-gradual/action.lua
@@ -1,3 +1,10 @@
 obj.spec.monoVertex.spec.lifecycle.desiredPhase = "Running"
-obj.spec.monoVertex.spec.replicas = null
+-- set strategy.fastResume to false
+if obj.spec.strategy == nil then
+    obj.spec.strategy = {}
+end
+if obj.spec.strategy.pauseResume == nil then
+    obj.spec.strategy.pauseResume = {}
+end
+obj.spec.strategy.pauseResume.fastResume = false
 return obj
\ No newline at end of file
diff --git a/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/testdata/PipelineRollout/rollout-running-fast.yaml b/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/testdata/PipelineRollout/rollout-running-fast.yaml
index 2ebd81924d..f2b46ca4ee 100644
--- a/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/testdata/PipelineRollout/rollout-running-fast.yaml
+++ b/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/testdata/PipelineRollout/rollout-running-fast.yaml
@@ -13,10 +13,12 @@ metadata:
   resourceVersion: "14008"
   uid: ab9286a1-f453-433e-846e-48900ab2068a
 spec:
+  strategy:
+    pauseResume:
+      fastResume: true
   pipeline:
     metadata:
       annotations:
-        numaflow.numaproj.io/resume-strategy: "fast"
         numaflow.numaproj.io/allowed-resume-strategies: "slow, fast"
     spec:
       lifecycle:
diff --git a/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/testdata/PipelineRollout/rollout-running-gradual.yaml b/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/testdata/PipelineRollout/rollout-running-gradual.yaml
index ef30b97e72..d24f6f259d 100644
--- a/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/testdata/PipelineRollout/rollout-running-gradual.yaml
+++ b/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/testdata/PipelineRollout/rollout-running-gradual.yaml
@@ -13,10 +13,12 @@ metadata:
   resourceVersion: "14008"
   uid: ab9286a1-f453-433e-846e-48900ab2068a
 spec:
+  strategy:
+    pauseResume:
+      fastResume: false
   pipeline:
     metadata:
       annotations:
-        numaflow.numaproj.io/resume-strategy: "slow"
         numaflow.numaproj.io/allowed-resume-strategies: "slow, fast"
     spec:
       lifecycle:
diff --git a/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/unpause-fast/action.lua b/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/unpause-fast/action.lua
index e67e2b9878..d5ef4822bd 100644
--- a/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/unpause-fast/action.lua
+++ b/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/unpause-fast/action.lua
@@ -1,9 +1,10 @@
 obj.spec.pipeline.spec.lifecycle.desiredPhase = "Running"
-if obj.spec.pipeline.metadata == nil then
-    obj.spec.pipeline.metadata = {}
+-- set strategy.fastResume to true
+if obj.spec.strategy == nil then
+    obj.spec.strategy = {}
 end
-if obj.spec.pipeline.metadata.annotations == nil then
-    obj.spec.pipeline.metadata.annotations = {}
+if obj.spec.strategy.pauseResume == nil then
+    obj.spec.strategy.pauseResume = {}
 end
-obj.spec.pipeline.metadata.annotations["numaflow.numaproj.io/resume-strategy"] = "fast"
+obj.spec.strategy.pauseResume.fastResume = true
 return obj
\ No newline at end of file
diff --git a/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/unpause-gradual/action.lua b/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/unpause-gradual/action.lua
index bab9104f56..ea50c8b592 100644
--- a/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/unpause-gradual/action.lua
+++ b/resource_customizations/numaplane.numaproj.io/PipelineRollout/actions/unpause-gradual/action.lua
@@ -1,9 +1,10 @@
 obj.spec.pipeline.spec.lifecycle.desiredPhase = "Running"
-if obj.spec.pipeline.metadata == nil then
-    obj.spec.pipeline.metadata = {}
+-- set strategy.fastResume to false
+if obj.spec.strategy == nil then
+    obj.spec.strategy = {}
 end
-if obj.spec.pipeline.metadata.annotations == nil then
-    obj.spec.pipeline.metadata.annotations = {}
+if obj.spec.strategy.pauseResume == nil then
+    obj.spec.strategy.pauseResume = {}
 end
-obj.spec.pipeline.metadata.annotations["numaflow.numaproj.io/resume-strategy"] = "slow"
+obj.spec.strategy.pauseResume.fastResume = false
 return obj
\ No newline at end of file