Promote NodeLease feature to GA

content/en/docs/concepts/architecture/nodes.md

@@ -173,19 +173,15 @@ to be unreachable. (The default timeouts are 40s to start reporting
 ConditionUnknown and 5m after that to start evicting pods.) The node controller
 checks the state of each node every `--node-monitor-period` seconds.
 
-In versions of Kubernetes prior to 1.13, NodeStatus is the heartbeat from the
-node. Starting from Kubernetes 1.13, node lease feature is introduced as an
-alpha feature (feature gate `NodeLease`,
-[KEP-0009](https://github.com/kubernetes/enhancements/blob/master/keps/sig-node/0009-node-heartbeat.md)).
-When node lease feature is enabled, each node has an associated `Lease` object in
-`kube-node-lease` namespace that is renewed by the node periodically, and both
-NodeStatus and node lease are treated as heartbeats from the node. Node leases
-are renewed frequently while NodeStatus is reported from node to master only
-when there is some change or enough time has passed (default is 1 minute, which
-is longer than the default timeout of 40 seconds for unreachable nodes). Since
-node lease is much more lightweight than NodeStatus, this feature makes node
-heartbeat significantly cheaper from both scalability and performance
-perspectives.
+Each node has an associated `Lease` object in `kube-node-lease` namespace.
+It is periodically renewed by Kubelet and both NodeStatus and node lease
+are treated as heartbeats from the node.
+Node leases are renewed frequently while NodeStatus is reported from node to
+master only where there is some change or enough time has passed (default is
+5 minutes, which is longer than the default timeout of 40 seconds for
+unreachable nodes). Since Lease is much more lighweigh object than Node,
+this feature make node heartbeats significantly cheaper from both scalability
+and performance perspectives.
 
 In Kubernetes 1.4, we updated the logic of the node controller to better handle
 cases when a large number of nodes have problems with reaching the master

content/en/docs/reference/command-line-tools-reference/feature-gates.md

@@ -99,8 +99,6 @@ different Kubernetes components.
 | `LocalStorageCapacityIsolationFSQuotaMonitoring` | `false` | Alpha | 1.15 | |
 | `MountContainers` | `false` | Alpha | 1.9 | |
 | `NodeDisruptionExclusion` | `false` | Alpha | 1.16 | |
-| `NodeLease` | `false` | Alpha | 1.12 | 1.13 |
-| `NodeLease` | `true` | Beta | 1.14 | |
 | `NonPreemptingPriority` | `false` | Alpha | 1.15 | |
 | `PodOverhead` | `false` | Alpha | 1.16 | - |
 | `PodShareProcessNamespace` | `false` | Alpha | 1.10 | 1.11 |
@@ -202,6 +200,9 @@ The following table contains feature gates for graduated or deprecated features.
 | `MountPropagation` | `false` | Alpha | 1.8 | 1.9 |
 | `MountPropagation` | `true` | Beta | 1.10 | 1.11 |
 | `MountPropagation` | `true` | GA | 1.12 | - |
+| `NodeLease` | `false` | Alpha | 1.12 | 1.13 |
+| `NodeLease` | `true` | Beta | 1.14 | 1.16 |
+| `NodeLease` | `true` | Beta | 1.17 | - |
 | `PersistentLocalVolumes` | `false` | Alpha | 1.7 | 1.9 |
 | `PersistentLocalVolumes` | `true` | Beta | 1.10 | 1.13 |
 | `PersistentLocalVolumes` | `true` | GA | 1.14 | - |