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-# Azure-VM-Diagnostics-Pruning
-This repo has a script that automates mass pruning of old Azure VM Diagnostic Metrics data in Azure Table Storage. 
+# Azure VM Diagnostic Metric Pruning
+This repo has a script that automates mass pruning of old Azure VM Diagnostic Metrics data in Azure Table Storage. Across a fleet of VMs that are running for multiple years, diagnostic metrics can consume significant table storage capacity. This script is targeted at clearing a year's-worth of those metrics at a time for a particular storage account.
+
+I have personally run this against a storage account used by a single VM and cleared almost 300 GB of storage from metrics that I no longer need to store.
+
+**Prerequisites:**
+
+1. Tenant ID
+2. Subscription ID
+3. Resource Group Name
+4. Storage Account Name
+
+![screenshot01](./images/screen01.png)
+![screenshot02](./images/screen02.png)
+![screenshot03](./images/screen03.png)
+
+## Contributing
+
+Contributions are welcome, please submit an issue or PR!
+
+## Disclaimer
+
+This script is provided as-is without any warranty or support. Use this script at your own risk. I am not responsible for any damages or data loss that may occur as a result of running this script. Before running this script, make sure to read and understand the code, and test it in a non-production environment.
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diff --git a/tableMetricsMaintenance.ps1 b/tableMetricsMaintenance.ps1
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+## Set information & Connect
+$TenantId = Read-Host -Prompt "Input the primary tenant ID"
+$SubscriptionId = Read-Host -Prompt "Input the primary subscription ID"
+Connect-AzAccount
+Set-AzContext -Tenant $TenantId -Subscription $SubscriptionId 
+
+$resourceGroup = Read-Host -Prompt "Resource Group Name"
+$storageAccountName = Read-Host -Prompt "Storage Account Name"
+$storageAccount = get-AzStorageAccount -ResourceGroupName $resourceGroup -Name $storageAccountName
+$ctx = $storageAccount.Context
+
+# List & Count all tables & capacity in context
+Get-AzStorageTable -Context $ctx
+Write-Host "Total tables in this storage account:"
+(Get-AzStorageTable -Context $ctx -Name "WADMetrics*").count
+
+# Filter the results by year and retrieve count
+$year = Read-Host -Prompt "Filter by year (e.g. 2018)"
+$year = "WADMetrics*" + $year + "*"
+$tables = Get-AzStorageTable -Context $ctx -Name $year
+$count = $tables.Count
+Write-Host "Total tables when filtering by specified year: $count"
+
+# Prompt the user to continue with deletion or cancel
+Write-Host "Do you want to remove all of the table entries for the specified year? Press 'y' to continue, otherwise press 'n' to cancel this script." -ForegroundColor Yellow
+$key = $Host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")
+if ($key.Character -eq "y") {
+    Write-Host "Continuing with script..." -ForegroundColor Green
+}
+else {
+    Write-Host "Cancelling script..." -ForegroundColor Red
+    return
+}
+
+# Remove all WADMetrics tables with the year in their name without confirmation, then re-count 
+$deletedTables = Get-AzStorageTable -Context $ctx -Name $year
+$deletedTables | Remove-AzStorageTable -Force
+Write-Host "Total tables after deleting specified year: $count"
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