Disable revision history for newdeploy (#1319)

pkg/executor/newdeploy/newdeploy.go

@@ -183,6 +183,12 @@ func (deploy *NewDeploy) getDeploymentSpec(fn *fv1.Function, env *fv1.Environmen
 	maxUnavailable := intstr.FromString("20%")
 	maxSurge := intstr.FromString("100%")
 
+	// Newdeploy updates the environment variable "LastUpdateTimestamp" of deployment
+	// whenever a configmap/secret gets an update, but it also leaves multiple ReplicaSets for
+	// rollback purpose. Since fission always update a deployment instead of performing a
+	// rollback, set RevisionHistoryLimit to 0 to disable this feature.
+	revisionHistoryLimit := int32(0)
+
 	deployment := &v1beta1.Deployment{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:   deployName,
@@ -242,6 +248,7 @@ func (deploy *NewDeploy) getDeploymentSpec(fn *fv1.Function, env *fv1.Environmen
 					MaxSurge:       &maxSurge,
 				},
 			},
+			RevisionHistoryLimit: &revisionHistoryLimit,
 		},
 	}