diff --git a/CHANGES.md b/CHANGES.md
index 435950bd..9e99c7bb 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,6 +4,22 @@ Notable changes between versions.
 
 ## Latest
 
+### Flatcar Linux
+
+#### AWS
+
+* Remove `os_image` option `flatcar-edge` ([#943](https://github.com/poseidon/typhoon/pull/943))
+
+#### Azure
+
+* Remove `os_image` option `flatcar-edge` ([#943](https://github.com/poseidon/typhoon/pull/943))
+
+#### Bare-Metal
+
+* Remove `os_channel` option `flatcar-edge` ([#943](https://github.com/poseidon/typhoon/pull/943))
+
+## v1.20.4
+
 * Kubernetes [v1.20.4](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.20.md#v1204)
 * Update Cilium from v1.9.1 to [v1.9.4](https://github.com/cilium/cilium/releases/tag/v1.9.4)
 * Update Calico from v3.17.1 to [v3.17.3](https://github.com/projectcalico/calico/releases/tag/v3.17.3)
diff --git a/aws/flatcar-linux/kubernetes/cl/controller.yaml b/aws/flatcar-linux/kubernetes/cl/controller.yaml
index 837aeeff..d05ff1f8 100644
--- a/aws/flatcar-linux/kubernetes/cl/controller.yaml
+++ b/aws/flatcar-linux/kubernetes/cl/controller.yaml
@@ -56,7 +56,6 @@ systemd:
         Wants=rpc-statd.service
         [Service]
         Environment=KUBELET_IMAGE=quay.io/poseidon/kubelet:v1.20.4
-        Environment=KUBELET_CGROUP_DRIVER=${cgroup_driver}
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/cni/net.d
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/manifests
         ExecStartPre=/bin/mkdir -p /opt/cni/bin
@@ -85,7 +84,6 @@ systemd:
           --authentication-token-webhook \
           --authorization-mode=Webhook \
           --bootstrap-kubeconfig=/etc/kubernetes/kubeconfig \
-          --cgroup-driver=$${KUBELET_CGROUP_DRIVER} \
           --client-ca-file=/etc/kubernetes/ca.crt \
           --cluster_dns=${cluster_dns_service_ip} \
           --cluster_domain=${cluster_domain_suffix} \
diff --git a/aws/flatcar-linux/kubernetes/controllers.tf b/aws/flatcar-linux/kubernetes/controllers.tf
index 907cf524..1bb9f42b 100644
--- a/aws/flatcar-linux/kubernetes/controllers.tf
+++ b/aws/flatcar-linux/kubernetes/controllers.tf
@@ -67,7 +67,6 @@ data "template_file" "controller-configs" {
     etcd_domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"
     # etcd0=https://cluster-etcd0.example.com,etcd1=https://cluster-etcd1.example.com,...
     etcd_initial_cluster   = join(",", data.template_file.etcds.*.rendered)
-    cgroup_driver          = local.channel == "edge" ? "systemd" : "cgroupfs"
     kubeconfig             = indent(10, module.bootstrap.kubeconfig-kubelet)
     ssh_authorized_key     = var.ssh_authorized_key
     cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
diff --git a/aws/flatcar-linux/kubernetes/variables.tf b/aws/flatcar-linux/kubernetes/variables.tf
index 9444bff1..0678bbbc 100644
--- a/aws/flatcar-linux/kubernetes/variables.tf
+++ b/aws/flatcar-linux/kubernetes/variables.tf
@@ -43,12 +43,12 @@ variable "worker_type" {
 
 variable "os_image" {
   type        = string
-  description = "AMI channel for a Container Linux derivative (flatcar-stable, flatcar-beta, flatcar-alpha, flatcar-edge)"
+  description = "AMI channel for a Container Linux derivative (flatcar-stable, flatcar-beta, flatcar-alpha)"
   default     = "flatcar-stable"
 
   validation {
-    condition     = contains(["flatcar-stable", "flatcar-beta", "flatcar-alpha", "flatcar-edge"], var.os_image)
-    error_message = "The os_image must be flatcar-stable, flatcar-beta, flatcar-alpha, or flatcar-edge."
+    condition     = contains(["flatcar-stable", "flatcar-beta", "flatcar-alpha"], var.os_image)
+    error_message = "The os_image must be flatcar-stable, flatcar-beta, or flatcar-alpha."
   }
 }
 
diff --git a/aws/flatcar-linux/kubernetes/workers/cl/worker.yaml b/aws/flatcar-linux/kubernetes/workers/cl/worker.yaml
index b66947fb..9387c7fb 100644
--- a/aws/flatcar-linux/kubernetes/workers/cl/worker.yaml
+++ b/aws/flatcar-linux/kubernetes/workers/cl/worker.yaml
@@ -28,7 +28,6 @@ systemd:
         Wants=rpc-statd.service
         [Service]
         Environment=KUBELET_IMAGE=quay.io/poseidon/kubelet:v1.20.4
-        Environment=KUBELET_CGROUP_DRIVER=${cgroup_driver}
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/cni/net.d
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/manifests
         ExecStartPre=/bin/mkdir -p /opt/cni/bin
@@ -60,7 +59,6 @@ systemd:
           --authentication-token-webhook \
           --authorization-mode=Webhook \
           --bootstrap-kubeconfig=/etc/kubernetes/kubeconfig \
-          --cgroup-driver=$${KUBELET_CGROUP_DRIVER} \
           --client-ca-file=/etc/kubernetes/ca.crt \
           --cluster_dns=${cluster_dns_service_ip} \
           --cluster_domain=${cluster_domain_suffix} \
diff --git a/aws/flatcar-linux/kubernetes/workers/variables.tf b/aws/flatcar-linux/kubernetes/workers/variables.tf
index 3b6b45ea..8ed3a8a7 100644
--- a/aws/flatcar-linux/kubernetes/workers/variables.tf
+++ b/aws/flatcar-linux/kubernetes/workers/variables.tf
@@ -36,12 +36,12 @@ variable "instance_type" {
 
 variable "os_image" {
   type        = string
-  description = "AMI channel for a Container Linux derivative (flatcar-stable, flatcar-beta, flatcar-alpha, flatcar-edge)"
+  description = "AMI channel for a Container Linux derivative (flatcar-stable, flatcar-beta, flatcar-alpha)"
   default     = "flatcar-stable"
 
   validation {
-    condition     = contains(["flatcar-stable", "flatcar-beta", "flatcar-alpha", "flatcar-edge"], var.os_image)
-    error_message = "The os_image must be flatcar-stable, flatcar-beta, flatcar-alpha, or flatcar-edge."
+    condition     = contains(["flatcar-stable", "flatcar-beta", "flatcar-alpha"], var.os_image)
+    error_message = "The os_image must be flatcar-stable, flatcar-beta, or flatcar-alpha."
   }
 }
 
diff --git a/aws/flatcar-linux/kubernetes/workers/workers.tf b/aws/flatcar-linux/kubernetes/workers/workers.tf
index 6df47bad..2f052f4c 100644
--- a/aws/flatcar-linux/kubernetes/workers/workers.tf
+++ b/aws/flatcar-linux/kubernetes/workers/workers.tf
@@ -85,7 +85,6 @@ data "template_file" "worker-config" {
     ssh_authorized_key     = var.ssh_authorized_key
     cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
     cluster_domain_suffix  = var.cluster_domain_suffix
-    cgroup_driver          = local.channel == "edge" ? "systemd" : "cgroupfs"
     node_labels            = join(",", var.node_labels)
   }
 }
diff --git a/azure/flatcar-linux/kubernetes/cl/controller.yaml b/azure/flatcar-linux/kubernetes/cl/controller.yaml
index 837aeeff..d05ff1f8 100644
--- a/azure/flatcar-linux/kubernetes/cl/controller.yaml
+++ b/azure/flatcar-linux/kubernetes/cl/controller.yaml
@@ -56,7 +56,6 @@ systemd:
         Wants=rpc-statd.service
         [Service]
         Environment=KUBELET_IMAGE=quay.io/poseidon/kubelet:v1.20.4
-        Environment=KUBELET_CGROUP_DRIVER=${cgroup_driver}
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/cni/net.d
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/manifests
         ExecStartPre=/bin/mkdir -p /opt/cni/bin
@@ -85,7 +84,6 @@ systemd:
           --authentication-token-webhook \
           --authorization-mode=Webhook \
           --bootstrap-kubeconfig=/etc/kubernetes/kubeconfig \
-          --cgroup-driver=$${KUBELET_CGROUP_DRIVER} \
           --client-ca-file=/etc/kubernetes/ca.crt \
           --cluster_dns=${cluster_dns_service_ip} \
           --cluster_domain=${cluster_domain_suffix} \
diff --git a/azure/flatcar-linux/kubernetes/controllers.tf b/azure/flatcar-linux/kubernetes/controllers.tf
index bbdf2e3f..3a18628f 100644
--- a/azure/flatcar-linux/kubernetes/controllers.tf
+++ b/azure/flatcar-linux/kubernetes/controllers.tf
@@ -150,7 +150,6 @@ data "template_file" "controller-configs" {
     etcd_domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"
     # etcd0=https://cluster-etcd0.example.com,etcd1=https://cluster-etcd1.example.com,...
     etcd_initial_cluster   = join(",", data.template_file.etcds.*.rendered)
-    cgroup_driver          = local.channel == "edge" ? "systemd" : "cgroupfs"
     kubeconfig             = indent(10, module.bootstrap.kubeconfig-kubelet)
     ssh_authorized_key     = var.ssh_authorized_key
     cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
diff --git a/azure/flatcar-linux/kubernetes/variables.tf b/azure/flatcar-linux/kubernetes/variables.tf
index 4c80460c..429cdeb8 100644
--- a/azure/flatcar-linux/kubernetes/variables.tf
+++ b/azure/flatcar-linux/kubernetes/variables.tf
@@ -48,12 +48,12 @@ variable "worker_type" {
 
 variable "os_image" {
   type        = string
-  description = "Channel for a Container Linux derivative (flatcar-stable, flatcar-beta, flatcar-alpha, flatcar-edge)"
+  description = "Channel for a Container Linux derivative (flatcar-stable, flatcar-beta, flatcar-alpha)"
   default     = "flatcar-stable"
 
   validation {
-    condition     = contains(["flatcar-stable", "flatcar-beta", "flatcar-alpha", "flatcar-edge"], var.os_image)
-    error_message = "The os_image must be flatcar-stable, flatcar-beta, flatcar-alpha, or flatcar-edge."
+    condition     = contains(["flatcar-stable", "flatcar-beta", "flatcar-alpha"], var.os_image)
+    error_message = "The os_image must be flatcar-stable, flatcar-beta, or flatcar-alpha."
   }
 }
 
diff --git a/azure/flatcar-linux/kubernetes/workers/cl/worker.yaml b/azure/flatcar-linux/kubernetes/workers/cl/worker.yaml
index b66947fb..9387c7fb 100644
--- a/azure/flatcar-linux/kubernetes/workers/cl/worker.yaml
+++ b/azure/flatcar-linux/kubernetes/workers/cl/worker.yaml
@@ -28,7 +28,6 @@ systemd:
         Wants=rpc-statd.service
         [Service]
         Environment=KUBELET_IMAGE=quay.io/poseidon/kubelet:v1.20.4
-        Environment=KUBELET_CGROUP_DRIVER=${cgroup_driver}
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/cni/net.d
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/manifests
         ExecStartPre=/bin/mkdir -p /opt/cni/bin
@@ -60,7 +59,6 @@ systemd:
           --authentication-token-webhook \
           --authorization-mode=Webhook \
           --bootstrap-kubeconfig=/etc/kubernetes/kubeconfig \
-          --cgroup-driver=$${KUBELET_CGROUP_DRIVER} \
           --client-ca-file=/etc/kubernetes/ca.crt \
           --cluster_dns=${cluster_dns_service_ip} \
           --cluster_domain=${cluster_domain_suffix} \
diff --git a/azure/flatcar-linux/kubernetes/workers/variables.tf b/azure/flatcar-linux/kubernetes/workers/variables.tf
index bcdc45a9..973fc1fb 100644
--- a/azure/flatcar-linux/kubernetes/workers/variables.tf
+++ b/azure/flatcar-linux/kubernetes/workers/variables.tf
@@ -46,12 +46,12 @@ variable "vm_type" {
 
 variable "os_image" {
   type        = string
-  description = "Channel for a Container Linux derivative (flatcar-stable, flatcar-beta, flatcar-alpha, flatcar-edge)"
+  description = "Channel for a Container Linux derivative (flatcar-stable, flatcar-beta, flatcar-alpha)"
   default     = "flatcar-stable"
 
   validation {
-    condition     = contains(["flatcar-stable", "flatcar-beta", "flatcar-alpha", "flatcar-edge"], var.os_image)
-    error_message = "The os_image must be flatcar-stable, flatcar-beta, flatcar-alpha, or flatcar-edge."
+    condition     = contains(["flatcar-stable", "flatcar-beta", "flatcar-alpha"], var.os_image)
+    error_message = "The os_image must be flatcar-stable, flatcar-beta, or flatcar-alpha."
   }
 }
 
diff --git a/azure/flatcar-linux/kubernetes/workers/workers.tf b/azure/flatcar-linux/kubernetes/workers/workers.tf
index 857c75db..ce9ba08d 100644
--- a/azure/flatcar-linux/kubernetes/workers/workers.tf
+++ b/azure/flatcar-linux/kubernetes/workers/workers.tf
@@ -104,7 +104,6 @@ data "template_file" "worker-config" {
     ssh_authorized_key     = var.ssh_authorized_key
     cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
     cluster_domain_suffix  = var.cluster_domain_suffix
-    cgroup_driver          = local.channel == "edge" ? "systemd" : "cgroupfs"
     node_labels            = join(",", var.node_labels)
   }
 }
diff --git a/bare-metal/flatcar-linux/kubernetes/cl/controller.yaml b/bare-metal/flatcar-linux/kubernetes/cl/controller.yaml
index e9a081ca..6202a847 100644
--- a/bare-metal/flatcar-linux/kubernetes/cl/controller.yaml
+++ b/bare-metal/flatcar-linux/kubernetes/cl/controller.yaml
@@ -64,7 +64,6 @@ systemd:
         Wants=rpc-statd.service
         [Service]
         Environment=KUBELET_IMAGE=quay.io/poseidon/kubelet:v1.20.4
-        Environment=KUBELET_CGROUP_DRIVER=${cgroup_driver}
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/cni/net.d
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/manifests
         ExecStartPre=/bin/mkdir -p /opt/cni/bin
@@ -93,7 +92,6 @@ systemd:
           --authentication-token-webhook \
           --authorization-mode=Webhook \
           --bootstrap-kubeconfig=/etc/kubernetes/kubeconfig \
-          --cgroup-driver=$${KUBELET_CGROUP_DRIVER} \
           --client-ca-file=/etc/kubernetes/ca.crt \
           --cluster_dns=${cluster_dns_service_ip} \
           --cluster_domain=${cluster_domain_suffix} \
diff --git a/bare-metal/flatcar-linux/kubernetes/cl/worker.yaml b/bare-metal/flatcar-linux/kubernetes/cl/worker.yaml
index 228b9cc9..4ad37388 100644
--- a/bare-metal/flatcar-linux/kubernetes/cl/worker.yaml
+++ b/bare-metal/flatcar-linux/kubernetes/cl/worker.yaml
@@ -36,7 +36,6 @@ systemd:
         Wants=rpc-statd.service
         [Service]
         Environment=KUBELET_IMAGE=quay.io/poseidon/kubelet:v1.20.4
-        Environment=KUBELET_CGROUP_DRIVER=${cgroup_driver}
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/cni/net.d
         ExecStartPre=/bin/mkdir -p /etc/kubernetes/manifests
         ExecStartPre=/bin/mkdir -p /opt/cni/bin
@@ -68,7 +67,6 @@ systemd:
           --authentication-token-webhook \
           --authorization-mode=Webhook \
           --bootstrap-kubeconfig=/etc/kubernetes/kubeconfig \
-          --cgroup-driver=$${KUBELET_CGROUP_DRIVER} \
           --client-ca-file=/etc/kubernetes/ca.crt \
           --cluster_dns=${cluster_dns_service_ip} \
           --cluster_domain=${cluster_domain_suffix} \
diff --git a/bare-metal/flatcar-linux/kubernetes/profiles.tf b/bare-metal/flatcar-linux/kubernetes/profiles.tf
index b41bf8df..8064ddf9 100644
--- a/bare-metal/flatcar-linux/kubernetes/profiles.tf
+++ b/bare-metal/flatcar-linux/kubernetes/profiles.tf
@@ -106,7 +106,6 @@ data "template_file" "controller-configs" {
     domain_name            = var.controllers.*.domain[count.index]
     etcd_name              = var.controllers.*.name[count.index]
     etcd_initial_cluster   = join(",", formatlist("%s=https://%s:2380", var.controllers.*.name, var.controllers.*.domain))
-    cgroup_driver          = var.os_channel == "flatcar-edge" ? "systemd" : "cgroupfs"
     cluster_dns_service_ip = module.bootstrap.cluster_dns_service_ip
     cluster_domain_suffix  = var.cluster_domain_suffix
     ssh_authorized_key     = var.ssh_authorized_key
@@ -134,7 +133,6 @@ data "template_file" "worker-configs" {
 
   vars = {
     domain_name            = var.workers.*.domain[count.index]
-    cgroup_driver          = var.os_channel == "flatcar-edge" ? "systemd" : "cgroupfs"
     cluster_dns_service_ip = module.bootstrap.cluster_dns_service_ip
     cluster_domain_suffix  = var.cluster_domain_suffix
     ssh_authorized_key     = var.ssh_authorized_key
diff --git a/bare-metal/flatcar-linux/kubernetes/variables.tf b/bare-metal/flatcar-linux/kubernetes/variables.tf
index ad8d3876..82dc9c61 100644
--- a/bare-metal/flatcar-linux/kubernetes/variables.tf
+++ b/bare-metal/flatcar-linux/kubernetes/variables.tf
@@ -12,11 +12,11 @@ variable "matchbox_http_endpoint" {
 
 variable "os_channel" {
   type        = string
-  description = "Channel for a Flatcar Linux (flatcar-stable, flatcar-beta, flatcar-alpha, flatcar-edge)"
+  description = "Channel for a Flatcar Linux (flatcar-stable, flatcar-beta, flatcar-alpha)"
 
   validation {
-    condition     = contains(["flatcar-stable", "flatcar-beta", "flatcar-alpha", "flatcar-edge"], var.os_channel)
-    error_message = "The os_channel must be flatcar-stable, flatcar-beta, flatcar-alpha, or flatcar-edge."
+    condition     = contains(["flatcar-stable", "flatcar-beta", "flatcar-alpha"], var.os_channel)
+    error_message = "The os_channel must be flatcar-stable, flatcar-beta, or flatcar-alpha."
   }
 }
 
diff --git a/docs/advanced/worker-pools.md b/docs/advanced/worker-pools.md
index 11bd2021..ddf843e6 100644
--- a/docs/advanced/worker-pools.md
+++ b/docs/advanced/worker-pools.md
@@ -90,7 +90,7 @@ The AWS internal `workers` module supports a number of [variables](https://githu
 |:-----|:------------|:--------|:--------|
 | worker_count | Number of instances | 1 | 3 |
 | instance_type | EC2 instance type | "t3.small" | "t3.medium" |
-| os_image | AMI channel for a Container Linux derivative | "flatcar-stable" | flatcar-stable, flatcar-beta, flatcar-alpha, flatcar-edge |
+| os_image | AMI channel for a Container Linux derivative | "flatcar-stable" | flatcar-stable, flatcar-beta, flatcar-alpha |
 | os_stream | Fedora CoreOS stream for compute instances | "stable" | "testing", "next" |
 | disk_size | Size of the EBS volume in GB | 40 | 100 |
 | disk_type | Type of the EBS volume | "gp2" | standard, gp2, io1 |
@@ -189,7 +189,7 @@ The Azure internal `workers` module supports a number of [variables](https://git
 |:-----|:------------|:--------|:--------|
 | worker_count | Number of instances | 1 | 3 |
 | vm_type | Machine type for instances | "Standard_DS1_v2" | See below |
-| os_image | Channel for a Container Linux derivative | "flatcar-stable" | flatcar-stable, flatcar-beta, flatcar-alpha, flatcar-edge |
+| os_image | Channel for a Container Linux derivative | "flatcar-stable" | flatcar-stable, flatcar-beta, flatcar-alpha |
 | priority | Set priority to Spot to use reduced cost surplus capacity, with the tradeoff that instances can be deallocated at any time | "Regular" | "Spot" |
 | snippets | Container Linux Config snippets | [] | [examples](/advanced/customization/) |
 | service_cidr | CIDR IPv4 range to assign to Kubernetes services | "10.3.0.0/16" | "10.3.0.0/24" |
diff --git a/docs/flatcar-linux/aws.md b/docs/flatcar-linux/aws.md
index 00b5e970..6932d844 100644
--- a/docs/flatcar-linux/aws.md
+++ b/docs/flatcar-linux/aws.md
@@ -210,7 +210,7 @@ Reference the DNS zone id with `aws_route53_zone.zone-for-clusters.zone_id`.
 | worker_count | Number of workers | 1 | 3 |
 | controller_type | EC2 instance type for controllers | "t3.small" | See below |
 | worker_type | EC2 instance type for workers | "t3.small" | See below |
-| os_image | AMI channel for a Container Linux derivative | "flatcar-stable" | flatcar-stable, flatcar-beta, flatcar-alpha, flatcar-edge |
+| os_image | AMI channel for a Container Linux derivative | "flatcar-stable" | flatcar-stable, flatcar-beta, flatcar-alpha |
 | disk_size | Size of the EBS volume in GB | 40 | 100 |
 | disk_type | Type of the EBS volume | "gp2" | standard, gp2, io1 |
 | disk_iops | IOPS of the EBS volume | 0 (i.e. auto) | 400 |
diff --git a/docs/flatcar-linux/azure.md b/docs/flatcar-linux/azure.md
index b6a7dfeb..f2c0ce94 100644
--- a/docs/flatcar-linux/azure.md
+++ b/docs/flatcar-linux/azure.md
@@ -228,7 +228,7 @@ Reference the DNS zone with `azurerm_dns_zone.clusters.name` and its resource gr
 | worker_count | Number of workers | 1 | 3 |
 | controller_type | Machine type for controllers | "Standard_B2s" | See below |
 | worker_type | Machine type for workers | "Standard_DS1_v2" | See below |
-| os_image | Channel for a Container Linux derivative | "flatcar-stable" | flatcar-stable, flatcar-beta, flatcar-alpha, flatcar-edge |
+| os_image | Channel for a Container Linux derivative | "flatcar-stable" | flatcar-stable, flatcar-beta, flatcar-alpha |
 | disk_size | Size of the disk in GB | 40 | 100 |
 | worker_priority | Set priority to Spot to use reduced cost surplus capacity, with the tradeoff that instances can be deallocated at any time | Regular | Spot |
 | controller_snippets | Controller Container Linux Config snippets | [] | [example](/advanced/customization/#usage) |
diff --git a/docs/flatcar-linux/bare-metal.md b/docs/flatcar-linux/bare-metal.md
index a462a539..eb2492de 100644
--- a/docs/flatcar-linux/bare-metal.md
+++ b/docs/flatcar-linux/bare-metal.md
@@ -330,7 +330,7 @@ Check the [variables.tf](https://github.com/poseidon/typhoon/blob/master/bare-me
 |:-----|:------------|:--------|
 | cluster_name | Unique cluster name | "mercury" |
 | matchbox_http_endpoint | Matchbox HTTP read-only endpoint | "http://matchbox.example.com:port" |
-| os_channel | Channel for a Container Linux derivative | flatcar-stable, flatcar-beta, flatcar-alpha, flatcar-edge |
+| os_channel | Channel for a Container Linux derivative | flatcar-stable, flatcar-beta, flatcar-alpha |
 | os_version | Version for a Container Linux derivative to PXE and install | "2345.3.1" |
 | k8s_domain_name | FQDN resolving to the controller(s) nodes. Workers and kubectl will communicate with this endpoint | "myk8s.example.com" |
 | ssh_authorized_key | SSH public key for user 'core' | "ssh-rsa AAAAB3Nz..." |