modules/AzStack.Insights/remediations/RemoveHealthCheckFilesForUpdates.ps1

<#
.SYNOPSIS
    Removes health check files created for updates from the system.
.DESCRIPTION
    Removes stale update health-check data from the cluster infrastructure share. For each installed
    solution update, the remediation removes the matching directory under
    C:\ClusterStorage\Infrastructure_1\Shares\SU1_Infrastructure_1\Updates\HealthCheck. It also removes
    older entries from the System health-check directory while retaining the ten most recently written
    entries.
 
    If any health-check data is removed, the remediation clears the Azure Stack HCI Update Service
    update cache through the update service endpoint so current data can be read again. Run this
    remediation when the AzureLocal.UpdateService.HighMemUsage insight reports that the update service
    was terminated after reaching its memory limit and stale health-check data is contributing to the
    retained state.
.PARAMETER Force
    If specified, the remediation will proceed without prompting the user for confirmation before applying.
.PARAMETER SkipEnvironmentCheck
    If specified, the remediation will proceed even if the environment requirements are not met.
    Use with caution as applying the remediation in an unsupported environment could cause unintended consequences.
.EXAMPLE
    Run the remediation interactively after confirming that no solution update is active.
    ```powershell
    Invoke-AzsSupportInsightRemediation -ScriptName "RemoveHealthCheckFilesForUpdates"
    ```
.EXAMPLE
    Run the remediation without prompting for confirmation.
    ```powershell
    Invoke-AzsSupportInsightRemediation -ScriptName "RemoveHealthCheckFilesForUpdates" -Parameters @{ Force = $true }
    ```
.NOTES
    - Prerequisites: Run with administrative rights on a supported 23H2 or 24H2 environment with access to the cluster infrastructure share. Cache clearing also requires the Update Service cluster group, its owner node, and a valid URP client certificate.
    - Risk and impact: Matching installed-update health-check directories and older System health-check entries are deleted permanently. If files are removed, the Update Service cache is cleared; no service or node restart is performed. No impact to workloads or services expected.
    - Expected result: Installed-update health-check directories are removed, the ten newest System health-check entries are retained, and the Update Service cache is cleared when cleanup occurred.
    - Stop conditions: Do not proceed while a solution update or health check is active, when the health-check files are needed for investigation, or when the expected infrastructure share, Update Service endpoint, or client certificate cannot be resolved.
    - Recovery: There is no automated rollback. Preserve required files before running; deleted files can only be restored from a backup if one was taken.
    - Verification: Confirm the installed-update directories are absent, no more than ten System entries remain, and the remediation log reports a successful cache clear when files were removed. Rerun the AzureLocal.UpdateService.HighMemUsage insight after observing the update service.
    - Trigger: This remediation is recommended by the AzureLocal.UpdateService.HighMemUsage insight when it reports WARNING.
#>


[CmdletBinding()]
param(
    [Parameter(Mandatory = $false, Position = 0)]
    [switch]$Force,

    [Parameter(Mandatory = $false, Position = 1)]
    [switch]$SkipEnvironmentCheck
)

Import-LocalizedData -BindingVariable 'localizedData' -BaseDirectory "$PSScriptRoot\locale" -UICulture $PSUICulture
$remediationObject = Initialize-RemediationObject -Properties $localizedData.Remediation -SkipEnvironmentCheck:$SkipEnvironmentCheck

# if $remediationObject.Status is set to 'NOT_APPLICABLE' at this point,
# it means that environment requirements are not met and user did not choose to SkipEnvironmentCheck,
# so we should exit without applying the remediation
if ($remediationObject.Status -eq [RemediationStatus]::NOT_APPLICABLE) {
    return $remediationObject
}

#if force is not specified, confirm that user wants to proceed with remediation
# confirm with the user before applying the remediation, if user cancels then update remediation status and exit
if (-not $Force) {
    if (-not (Confirm-RemediationAction -Properties $localizedData.Remediation)) {
        $remediationObject.Status = [RemediationStatus]::USER_CANCELLED
        return $remediationObject
    }
}

$changesApplied = $false # tracks whether changes applied in the remediation logic

try {
    <# START REPAIR LOGIC #>
    $removedHC = $false
    $healthCheckRoot = "C:\ClusterStorage\Infrastructure_1\Shares\SU1_Infrastructure_1\Updates\HealthCheck"

    Write-AzsSupportLog -Level 'Informational' -Message "Checking for installed updates."
    $installedUpdates = Get-SolutionUpdate | Where-Object State -eq Installed
    $resourceIds = @( $installedUpdates | ForEach-Object { $_.ResourceId.Split('/')[-1] } )
    Write-AzsSupportLog -Level 'Informational' -Message "Found $($installedUpdates.Count) installed updates: $($resourceIds -join ', ')"

    if ($resourceIds.Count -gt 0) {
        foreach ($resourceId in $resourceIds) {
            $healthCheckPath = Join-Path -Path $healthCheckRoot -ChildPath $resourceId
            if (Test-Path -Path $healthCheckPath) {
                Write-AzsSupportLog -Level 'Informational' -Message "Removing health check directory for $resourceId"
                # Each installed-update resource ID maps to a directory containing health-check data,
                # so recursive removal is required to delete the directory and its contents.
                Remove-Item -Path $healthCheckPath -Recurse -Force -Verbose
                $removedHC = $true
                $changesApplied = $true
            }
            else {
                Write-AzsSupportLog -Level 'Informational' -Message "No health check found for $resourceId at $healthCheckPath"
            }
        }
    }

    # Clean up stale system health check results, retaining the most recent 10
    $systemHealthPath = Join-Path -Path $healthCheckRoot -ChildPath "System"
    if (Test-Path -Path $systemHealthPath) {
        $oldSystemChecks = Get-ChildItem -Path $systemHealthPath | Sort-Object LastWriteTime | Select-Object -SkipLast 10
        if ($oldSystemChecks) {
            Write-AzsSupportLog -Level 'Informational' -Message "Removing $($oldSystemChecks.Count) old system health check results."
            # Entries directly under the System path are JSON result files, not directories.
            # Do not use -Recurse here; plain file removal is the intended operation.
            $oldSystemChecks | Remove-Item -Force -Verbose
            $removedHC = $true
            $changesApplied = $true
        }
        else {
            Write-AzsSupportLog -Level 'Informational' -Message "No stale health checks found at $systemHealthPath"
        }
    }

    # If any health check files were removed, clear the update service cache so that it re-reads the data
    if ($removedHC) {
        $dnsDomain = (Get-Cluster -ErrorAction Ignore).Domain
        if ($null -ieq $dnsDomain) {
            $dnsDomain = $env:USERDNSDOMAIN
        }

        Write-AzsSupportLog -Level 'Informational' -Message "Some health checks were removed, so clearing update service cache."
        $clientCert = Get-ChildItem -Path 'Cert:\LocalMachine\My\' | Where-Object { $_.Subject -match "URP" } | Sort-Object NotAfter | Select-Object -Last 1
        $updateServiceOwner = Get-ClusterGroup -Name "Azure Stack HCI Update Service Cluster Group" | ForEach-Object OwnerNode | ForEach-Object Name
        $updateEndpoint = "https://{0}.{1}:4900" -f $updateServiceOwner, $dnsDomain
        $clearCacheResult = Invoke-WebRequest -Certificate $clientCert -UseBasicParsing -Uri "$updateEndpoint/caches/Update" -Method "Delete"
        if ([int]::TryParse($clearCacheResult.Content, [ref]$null)) {
            Write-AzsSupportLog -Level 'Informational' -Message "Removed $($clearCacheResult.Content) updates from the cache."
        }
        else {
            Write-AzsSupportLog -Level 'Informational' -Message "Result from clearing the cache: $($clearCacheResult | Out-String)"
        }
    }
    <# END REPAIR LOGIC #>

    if ($changesApplied) {
        $remediationObject.ChangesApplied = $true
        $remediationObject.Status = [RemediationStatus]::SUCCESS
        Write-AzsSupportLog -Level 'Informational' -Message $localizedData.ChangesApplied
    }
    else {
        $remediationObject.ChangesApplied = $false
        $remediationObject.Status = [RemediationStatus]::NO_CHANGE_APPLIED
        Write-AzsSupportLog -Level 'Informational' -Message $localizedData.ChangesNotApplied
    }
}
catch {
    # ensure that any exceptions are caught and the remediation status is updated accordingly
    # but do not rethrow the exception as we want to continue with any other remediation steps if applicable
    $_ | Write-AzsSupportLog -Level 'Exception'
    $remediationObject.ScriptStackTrace = Get-FormattedException -Exception $_
    $remediationObject.ExceptionMessage = $localizedData.ChangesFailed -f $_.Exception.Message
    $remediationObject.Status = [RemediationStatus]::FAILURE
}

return $remediationObject

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