function Write-ApplicationInsightsMetric
{
    [CmdletBinding()]
    param(
            [Parameter(Mandatory=$true)][string] $InstrumentationKey,
            [Parameter(Mandatory=$true)][string] $MetricKey,
            [Parameter(Mandatory=$true)][string] $MetricValue
            )
    try
    {
        $TelClient = New-Object -TypeName Microsoft.ApplicationInsights.TelemetryClient
        $TelClient.InstrumentationKey = $InstrumentationKey
        $TelClient.TrackMetric($MetricKey, $MetricValue)
        $TelClient.Flush()
    }
    catch
    {
        Write-Output "Exception while logging into Application Insights: $($_.Exception.Message)"
    }
}

Export-ModuleMember -Function Write-ApplicationInsightsMetric

@{

    # Script module or binary module file associated with this manifest.
    RootModule = 'ApplicationInsightsCustomMetric.psm1'

    # Version number of this module.
    ModuleVersion = '1.0.0'

    # Author of this module
    Author = 'mkyz08'

    # Company or vendor of this module
    CompanyName = ''

    # Copyright statement for this module
    Copyright = ''

    # Modules to import as nested modules of the module specified in RootModule/ModuleToProcess
    NestedModules = @('.\Microsoft.ApplicationInsights.dll') 

    # Functions to export from this module, for best performance, do not use wildcards and do not delete the entry, use an empty array if there are no functions to export.
    FunctionsToExport = @('*')

    # Cmdlets to export from this module, for best performance, do not use wildcards and do not delete the entry, use an empty array if there are no cmdlets to export.
    CmdletsToExport = @('*')

    # Variables to export from this module
    VariablesToExport = '*'

    # Aliases to export from this module, for best performance, do not use wildcards and do not delete the entry, use an empty array if there are no aliases to export.
    AliasesToExport = @()

    # Private data to pass to the module specified in RootModule/ModuleToProcess. This may also contain a PSData hashtable with additional module metadata used by PowerShell.
    PrivateData = @{

        PSData = @{

        } # End of PSData hashtable

    } # End of PrivateData hashtable

    }    

# マネージドIDによる接続
Connect-AzAccount -Identity

try {
    $ResourceGroupName = 'resource-group-name'
    $HostPoolName = 'host-pool-name'
    $InstrumentationKey = Get-AutomationVariable -Name 'app-insight-instrumentation-key' # インストルメンテーションキー

    # セッション数取得
    $userSessions = Get-AzWvdUserSession -ResourceGroupName $ResourceGroupName -HostPoolName $HostPoolName
    Write-Output ("Session num:" + $userSessions.Count)

    # セッション数をApplication Insight(Metric)へ連携
    Write-ApplicationInsightsCustomMetric $InstrumentationKey "UserCount-HostPool-xxx" $userSessions.Count

    # ユーザがいる場合はユーザ名をApplication Insight(Log)へ連携
    if ( $userSessions.Count -gt 0 ){
        $userList = ''
        foreach($eachUser in $userSessions){
            $userList = $userList + '   ' + $eachUser.UserPrincipalName
        }
        Write-ApplicationInsightsTrace $InstrumentationKey $userList "Information"
    }
}
catch {
    $ErrorMessage = $_.Exception.message
    Write-Error ("Error occurred when starting vm:" + $ErrorMessage)
    Break
}

traces
| where severityLevel == 1