diff --git a/mlab-oti/platform-cluster.tf b/mlab-oti/platform-cluster.tf
index c63db8e..1961318 100644
--- a/mlab-oti/platform-cluster.tf
+++ b/mlab-oti/platform-cluster.tf
@@ -15,137 +15,201 @@ module "platform-cluster" {
       mig_min_replicas = 1
       mig_max_replicas = 5
       network_tier     = "PREMIUM"
+      probability      = 1.0
       tags             = ["ndt-cloud"]
       scopes           = ["cloud-platform"]
     }
     migs = {
       mlab1-ams11 = {
-        region = "europe-west4"
+        region       = "europe-west4"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-ber02 = {
         # We cannot currently get any N2 quota in this region.
-        machine_type = "e2-highcpu-4"
         region       = "europe-west10"
+        machine_type = "e2-highcpu-4"
+        loadbalanced = true
       },
       mlab1-bom06 = {
-        region = "asia-south1"
+        region       = "asia-south1"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-bru07 = {
-        region = "europe-west1"
+        region       = "europe-west1"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-cgk02 = {
-        region = "asia-southeast2"
+        region       = "asia-southeast2"
+        loadbalanced = true
       },
       mlab1-chs02 = {
-        region = "us-east1"
+        region       = "us-east1"
+        loadbalanced = true
       },
       mlab1-cmh02 = {
-        region = "us-east5"
+        region       = "us-east5"
+        loadbalanced = true
       },
       mlab1-del05 = {
-        region = "asia-south2"
+        region       = "asia-south2"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-dfw12 = {
-        region = "us-south1"
+        region       = "us-south1"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-doh02 = {
         # This region is new and we can't currently get any N2 quota.
-        machine_type = "e2-highcpu-4"
         region       = "me-central1"
+        machine_type = "e2-highcpu-4"
+        loadbalanced = true
       },
       mlab1-fra08 = {
-        region = "europe-west3"
+        region       = "europe-west3"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-gru06 = {
-        region = "southamerica-east1"
+        region       = "southamerica-east1"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-hel02 = {
-        region = "europe-north1"
+        region       = "europe-north1"
+        loadbalanced = true
       },
       mlab1-hkg05 = {
-        region = "asia-east2"
+        region       = "asia-east2"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-hnd07 = {
-        region = "asia-northeast1"
+        region       = "asia-northeast1"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-iad09 = {
-        region = "us-east4"
+        region       = "us-east4"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-icn02 = {
-        region = "asia-northeast3"
+        region       = "asia-northeast3"
+        loadbalanced = true
       },
       mlab1-jnb02 = {
         # This region is new and we can't currently get any N2 quota.
-        machine_type = "e2-highcpu-4"
         region       = "africa-south1"
+        machine_type = "e2-highcpu-4"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-kix02 = {
-        region = "asia-northeast2"
+        region       = "asia-northeast2"
+        loadbalanced = true
       },
       mlab1-las02 = {
-        region = "us-west4"
+        region       = "us-west4"
+        loadbalanced = true
       },
       mlab1-lax10 = {
-        region = "us-west2"
+        region       = "us-west2"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-lhr10 = {
-        region = "europe-west2"
+        region       = "europe-west2"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-mad08 = {
-        region = "europe-southwest1"
+        region       = "europe-southwest1"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-mel02 = {
-        region = "australia-southeast2"
+        region       = "australia-southeast2"
+        loadbalanced = true
       },
       mlab1-mil09 = {
-        region = "europe-west8"
+        region       = "europe-west8"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-oma02 = {
-        region = "us-central1"
+        region       = "us-central1"
+        loadbalanced = true
       },
       mlab1-par09 = {
-        region = "europe-west9"
+        region       = "europe-west9"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-pdx03 = {
-        region = "us-west1"
+        region       = "us-west1"
+        loadbalanced = true
       },
       mlab1-scl06 = {
-        region = "southamerica-west1"
+        region       = "southamerica-west1"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-sin03 = {
-        region = "asia-southeast1"
+        region       = "asia-southeast1"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-slc02 = {
-        region = "us-west3"
+        region       = "us-west3"
+        loadbalanced = true
       },
       mlab1-syd08 = {
-        region = "australia-southeast1"
+        region       = "australia-southeast1"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-tlv02 = {
-        region = "me-west1"
+        region       = "me-west1"
+        loadbalanced = true
       },
       mlab1-tpe03 = {
-        region = "asia-east1"
+        region       = "asia-east1"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-trn04 = {
-        region = "europe-west12"
+        region       = "europe-west12"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-waw02 = {
-        region = "europe-central2"
+        region       = "europe-central2"
+        loadbalanced = true
       },
       mlab1-yul08 = {
-        region = "northamerica-northeast1"
+        region       = "northamerica-northeast1"
+        loadbalanced = true
+        probability  = 0.5
       },
       mlab1-yyz08 = {
-        region = "northamerica-northeast2"
+        region       = "northamerica-northeast2"
+        loadbalanced = true
+        probability  = 0.5
       }
       mlab1-zrh02 = {
-        region = "europe-west6"
+        region       = "europe-west6"
+        loadbalanced = true
       }
     }
     vms = {
       mlab1-par08 = {
-        zone = "europe-west9-c"
+        zone        = "europe-west9-c"
+        probability = 0.5
       },
       mlab1-pdx01 = {
         zone = "us-west1-c"
diff --git a/mlab-sandbox/platform-cluster.tf b/mlab-sandbox/platform-cluster.tf
index 02b0815..5b5fe9d 100644
--- a/mlab-sandbox/platform-cluster.tf
+++ b/mlab-sandbox/platform-cluster.tf
@@ -8,26 +8,31 @@ module "platform-cluster" {
   instances = {
     attributes = {
       daemonset        = "ndt"
-      disk_image       = "platform-cluster-instance-2024-09-12t22-10-23"
+      disk_image       = "platform-cluster-instance-2024-11-27t00-16-26"
       disk_size_gb     = 100
       disk_type        = "pd-ssd"
       machine_type     = "n2-highcpu-4"
       mig_min_replicas = 1
       mig_max_replicas = 2
       network_tier     = "PREMIUM"
+      probability      = 1.0
       tags             = ["ndt-cloud"]
       scopes           = ["cloud-platform"]
     },
     migs = {
       mlab1-chs0t = {
-        region = "us-east1"
+        region       = "us-east1"
+        loadbalanced = false
+        daemonset    = "ndt-autojoin"
       },
       mlab1-lax0t = {
-        daemonset = "ndt-canary"
-        region    = "us-west2"
+        region       = "us-west2"
+        loadbalanced = true
+        daemonset    = "ndt-canary"
       },
       mlab1-pdx0t = {
-        region = "us-west1"
+        region       = "us-west1"
+        loadbalanced = true
       }
     },
     vms = {
@@ -39,7 +44,7 @@ module "platform-cluster" {
 
   api_instances = {
     machine_attributes = {
-      disk_image        = "platform-cluster-api-instance-2024-09-12t22-10-23"
+      disk_image        = "platform-cluster-api-instance-2024-11-27t00-16-26"
       disk_size_gb_boot = 100
       disk_size_gb_data = 10
       # This will show up as /dev/disk/by-id/google-<name>
@@ -73,7 +78,7 @@ module "platform-cluster" {
   }
 
   prometheus_instance = {
-    disk_image        = "platform-cluster-internal-instance-2024-09-12t22-10-23"
+    disk_image        = "platform-cluster-internal-instance-2024-11-27t00-16-26"
     disk_size_gb_boot = 100
     disk_size_gb_data = 200
     disk_type         = "pd-ssd"
diff --git a/mlab-staging/platform-cluster.tf b/mlab-staging/platform-cluster.tf
index 2965b4f..b25bba8 100644
--- a/mlab-staging/platform-cluster.tf
+++ b/mlab-staging/platform-cluster.tf
@@ -15,12 +15,14 @@ module "platform-cluster" {
       mig_min_replicas = 1
       mig_max_replicas = 3
       network_tier     = "PREMIUM"
+      probability      = 1.0
       tags             = ["ndt-cloud"]
       scopes           = ["cloud-platform"]
     },
     migs = {
       mlab4-dfw13 = {
-        region = "us-south1"
+        region       = "us-south1"
+        loadbalanced = true
       }
     },
     vms = {
diff --git a/modules/platform-cluster/instancegroups.tf b/modules/platform-cluster/instancegroups.tf
index 82d08a3..f7a1e57 100644
--- a/modules/platform-cluster/instancegroups.tf
+++ b/modules/platform-cluster/instancegroups.tf
@@ -29,7 +29,9 @@ resource "google_compute_instance_template" "platform_cluster_mig_templates" {
       "mlab/site=${split("-", each.key)[1]}",
       "mlab/type=virtual"
     ])
-    k8s_node = "${each.key}.${data.google_client_config.current.project}.measurement-lab.org"
+    k8s_node     = "${each.key}.${data.google_client_config.current.project}.measurement-lab.org"
+    loadbalanced = each.value.loadbalanced
+    probability  = lookup(each.value, "probability", var.instances.attributes.probability)
   }
 
   name_prefix = "platform-cluster-mig-template-"
diff --git a/modules/platform-cluster/instances.tf b/modules/platform-cluster/instances.tf
index 2cd1c9b..2edd51e 100644
--- a/modules/platform-cluster/instances.tf
+++ b/modules/platform-cluster/instances.tf
@@ -121,7 +121,8 @@ resource "google_compute_instance" "platform_instances" {
       "mlab/site=${split("-", each.key)[1]}",
       "mlab/type=virtual"
     ])
-    k8s_node = "${each.key}.${data.google_client_config.current.project}.measurement-lab.org"
+    k8s_node    = "${each.key}.${data.google_client_config.current.project}.measurement-lab.org"
+    probability = lookup(each.value, "probability", var.instances.attributes.probability)
   }
 
   name = "${each.key}-${data.google_client_config.current.project}-measurement-lab-org"
@@ -134,7 +135,7 @@ resource "google_compute_instance" "platform_instances" {
     }
 
     ipv6_access_config {
-      external_ipv6 = google_compute_address.platform_addresses_v6["${each.key}"].address
+      external_ipv6               = google_compute_address.platform_addresses_v6["${each.key}"].address
       external_ipv6_prefix_length = 96
       # From what I gather STANDARD network tier is not available for IPv6.
       # https://cloud.google.com/network-tiers/docs/overview#resources
diff --git a/modules/platform-cluster/loadbalancers.tf b/modules/platform-cluster/loadbalancers.tf
index 012178e..8b329a7 100644
--- a/modules/platform-cluster/loadbalancers.tf
+++ b/modules/platform-cluster/loadbalancers.tf
@@ -2,7 +2,7 @@
 # Managed instance group load balancers for regular platfrom VMs
 #
 resource "google_compute_address" "platform_cluster_mig_addresses" {
-  for_each = var.instances.migs
+  for_each = { for k, v in var.instances.migs : k => v if v.loadbalanced }
 
   address_type = "EXTERNAL"
   name         = "${each.key}-${data.google_client_config.current.project}-measurement-lab-org"
@@ -10,7 +10,7 @@ resource "google_compute_address" "platform_cluster_mig_addresses" {
 }
 
 resource "google_compute_address" "platform_cluster_mig_addresses_v6" {
-  for_each = var.instances.migs
+  for_each = { for k, v in var.instances.migs : k => v if v.loadbalanced }
 
   address_type       = "EXTERNAL"
   ipv6_endpoint_type = "NETLB"
@@ -21,7 +21,7 @@ resource "google_compute_address" "platform_cluster_mig_addresses_v6" {
 }
 
 resource "google_compute_region_health_check" "platform_cluster_mig_health_checks" {
-  for_each = var.instances.migs
+  for_each = { for k, v in var.instances.migs : k => v if v.loadbalanced }
 
   https_health_check {
     port = 443
@@ -32,7 +32,7 @@ resource "google_compute_region_health_check" "platform_cluster_mig_health_check
 }
 
 resource "google_compute_region_backend_service" "platform_cluster_mig_backends" {
-  for_each = var.instances.migs
+  for_each = { for k, v in var.instances.migs : k => v if v.loadbalanced }
 
   backend {
     group = google_compute_region_instance_group_manager.platform_cluster_mig_managers[each.key].instance_group
@@ -47,7 +47,7 @@ resource "google_compute_region_backend_service" "platform_cluster_mig_backends"
 }
 
 resource "google_compute_forwarding_rule" "platform_cluster_mig_forwarding_rules" {
-  for_each = var.instances.migs
+  for_each = { for k, v in var.instances.migs : k => v if v.loadbalanced }
 
   all_ports             = true
   backend_service       = google_compute_region_backend_service.platform_cluster_mig_backends[each.key].id
@@ -59,7 +59,7 @@ resource "google_compute_forwarding_rule" "platform_cluster_mig_forwarding_rules
 }
 
 resource "google_compute_forwarding_rule" "platform_cluster_mig_forwarding_rules_v6" {
-  for_each = var.instances.migs
+  for_each = { for k, v in var.instances.migs : k => v if v.loadbalanced }
 
   all_ports             = true
   backend_service       = google_compute_region_backend_service.platform_cluster_mig_backends[each.key].id
diff --git a/modules/platform-cluster/variables.tf b/modules/platform-cluster/variables.tf
index 251b353..eb52752 100644
--- a/modules/platform-cluster/variables.tf
+++ b/modules/platform-cluster/variables.tf
@@ -10,6 +10,7 @@ variable "instances" {
       mig_min_replicas = number
       mig_max_replicas = number
       network_tier     = string
+      probability      = number
       tags             = list(string)
       scopes           = list(string)
     })