Display JSON Properties in Kusto Query - specific Subnets - json

Question

Hello i have a little problem i couldn't find an answer i could understand anywhere.
i am about to make a dashboard in azure by using Azure Resource Graph Explorer and their Kusto query language, i would like to display how many Subnets there is i the subscription.
but when i try to seperate and show the subnets in it only show me either the amount of Vnets there is or it show one line of subnets and not how many.
i've tried to project the subnets with following code but dont know what to write to show a single line with two rows with the name "subnets" and how many of them.
Summary: is that; i want to write a Kusto query that i can pin to dashboard that shows how many subnets there is.
Code i tried to write:
resources
| project properties.subnets
output is:
properties_subnets
null
[{"type":"Microsoft.Network/virtualNetworks/subnets","properties":{"provisioningState":"Succeeded", etc. etc. etc.
{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"virtualNetworks_Vnet_name": {
"defaultValue": "Vnet",
"type": "String"
}
},
"variables": {},
"resources": [
{
"type": "Microsoft.Network/virtualNetworks",
"apiVersion": "2020-05-01",
"name": "[parameters('virtualNetworks_Vnet_name')]",
"location": "westeurope",
"properties": {
"addressSpace": {
"addressPrefixes": [
"10.0.0.0/16"
]
},
"subnets": [
{
"name": "default",
"properties": {
"addressPrefix": "10.0.0.0/24",
"delegations": [],
"privateEndpointNetworkPolicies": "Enabled",
"privateLinkServiceNetworkPolicies": "Enabled"
}
},
{
"name": "default2",
"properties": {
"addressPrefix": "10.0.1.0/24",
"serviceEndpoints": [],
"delegations": [],
"privateEndpointNetworkPolicies": "Enabled",
"privateLinkServiceNetworkPolicies": "Enabled"
}
}
],
"virtualNetworkPeerings": [],
"enableDdosProtection": false,
"enableVmProtection": false
}
},
{
"type": "Microsoft.Network/virtualNetworks/subnets",
"apiVersion": "2020-05-01",
"name": "[concat(parameters('virtualNetworks_Vnet_name'), '/default')]",
"dependsOn": [
"[resourceId('Microsoft.Network/virtualNetworks', parameters('virtualNetworks_Vnet_name'))]"
],
"properties": {
"addressPrefix": "10.0.0.0/24",
"delegations": [],
"privateEndpointNetworkPolicies": "Enabled",
"privateLinkServiceNetworkPolicies": "Enabled"
}
},
{
"type": "Microsoft.Network/virtualNetworks/subnets",
"apiVersion": "2020-05-01",
"name": "[concat(parameters('virtualNetworks_Vnet_name'), '/default2')]",
"dependsOn": [
"[resourceId('Microsoft.Network/virtualNetworks', parameters('virtualNetworks_Vnet_name'))]"
],
"properties": {
"addressPrefix": "10.0.1.0/24",
"serviceEndpoints": [],
"delegations": [],
"privateEndpointNetworkPolicies": "Enabled",
"privateLinkServiceNetworkPolicies": "Enabled"
}
}
]
}

Answer 1

resources
| where type=~"Microsoft.Network/virtualNetworks"
| project array_length(properties.subnets)