????通過上一篇的簡介，相信各位對于簡單的創建alert，以及Azure monitor使用以及大概有個印象了。基礎的使用總是非常簡單的，這里再分享一個常用的alert使用方法

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????實際工作中，不管是日常運維還是做項目，我們都需要知道VM的實際性能情況，避免出現性能瓶頸，因此創建alert是一種非常方便的方式，我們可以通過alert第一時間知道系統出現了性能的瓶頸，以便盡快采取解決措施。

????因此，也衍生了一個實際的問題，單獨為一臺VM開啟alert很簡單，但是如果我們需要為一個資源組內十幾甚至幾十上百臺VM統一創建alert，則會非常麻煩

????在這里分享一個自己寫的簡單腳本，可以通過批量的方式為一個資源組內的所有VM，或者是某個單獨的VM創建alert，省去很多不必要的重復性工作，以下是代碼的內容

<#?.NOTES===========================================================================Created?with:??SAPIEN?Technologies,?Inc.,?PowerShell?Studio?2017?v5.4.134Created?on:????2019/1/10?13:19Created?by:????mxyOrganization:??Filename:??????===========================================================================.DESCRIPTIONA?description?of?the?file.
#>
param
([parameter(Mandatory?=?$true)][string]$RGName,#資源組名稱[parameter(Mandatory?=?$false)][string]$VmName,#VM名稱[parameter(Mandatory?=?$true)][string]$MailAddress,#郵件地址[parameter(Mandatory?=?$false)][ValidateSet("CPU",?"Memory")][string]$Metric?=?"CPU",#需要針對哪個metric創建alert,方便起見這里目前只是設置了CPU和內存兩種[parameter(Mandatory?=?$false)][ValidateSet("GreaterThan",?"GreaterThanOrEqual",?"LessThan",?"LessThanOrEqual")][string]$Operation?=?"GreaterThan",#操作條件[parameter(Mandatory?=?$false)][int]$Threshold?=?50,#閾值[parameter(Mandatory?=?$false)][ValidateSet("Average",?"Last",?"Maximum",?"Minimum",?"Total")]#計算方式，是平均還是最大等[string]$TimeAggregationOperator?=?"Average",[parameter(Mandatory?=?$false)][TimeSpan]$WindowSize?=?"00:05:00"#時間戳)function?Write-DateTimeMessage
{param?([parameter(Mandatory?=?$false)][switch]$Warning,[parameter(Mandatory?=?$true)][string]$Message,[parameter(Mandatory?=?$false)][string]$ForegroundColor)if?($Warning){Write-Warning?($(Get-Date?-UFormat?'%Y/%m/%d?%H:%M:%S')?+?"?*?"?+?$Message)}else{if?($ForegroundColor){Write-Host?($(Get-Date?-UFormat?'%Y/%m/%d?%H:%M:%S')?+?"?*?"?+?$Message)?-ForegroundColor?$ForegroundColor}else{Write-Host?($(Get-Date?-UFormat?'%Y/%m/%d?%H:%M:%S')?+?"?*?"?+?$Message)}}}#Get?metric?name
switch?($Metric)
{Memory?{$MetricName?=?"\Memory\%?Committed?Bytes?In?Use"}CPU?{$MetricName?=?"\Processor?Information(_Total)\%?Processor?Time"}default{#<code>}
}
#Find?the?vm?if?vmname?parameter?specified
try
{$Error.Clear()if?($VmName){Write-DateTimeMessage?"Trying?to?find?vm?$VmName?in?resource?group?$RGName"$vms?=?Get-AzureRmVM?-ResourceGroupName?$RGName?-Name?$VmName?-ErrorAction?StopWrite-DateTimeMessage?"vm?$VmName?Found?in?resource?group?$RGName"}else{$vms?=?Get-AzureRmVM?-ResourceGroupName?$RGName?-ErrorAction?Stop}#?Create?action?email$actionEmail?=?New-AzureRmAlertRuleEmail?-CustomEmail?$MailAddress?-WarningAction?SilentlyContinue#?Get?resource?id?and?add?alertif?($vms?-ne?$null){foreach?($vm?in?$vms){$vmID?=?$vm.id$AlertName?=?$vm.Name?+?"_Alert_"?+?$Metric?+?"_"?+?$Operation?+?"_"?+?$Threshold?+?"_"?+?$actionEmail.CustomEmails$Error.Clear()Write-DateTimeMessage?"Trying?to?add?alert?for?vm?$($vm.Name)?..."Add-AzureRmMetricAlertRule?-Name?$AlertName?-Location?"ChinaEast"?-ResourceGroup?$RGName?-TargetResourceId?$vmID?-MetricName?$MetricName?-Operator?$Operation?-Threshold?$Threshold?-WindowSize?$WindowSize?-TimeAggregationOperator?$TimeAggregationOperator?-Action?$actionEmail?-ErrorAction?'Stop'?-WarningAction?'SilentlyContinue'?|?Out-NullWrite-DateTimeMessage?"Add?alert?for?vm?$($vm.Name)?successfully!"}}else{Write-DateTimeMessage?"No?vm?in?resource?group?$RGName"}}
catch
{Write-DateTimeMessage?$Error[0].Exception.Message
}

可以看到腳本很簡單，運行方法這里舉個例子，比如要為mxytest這個資源組下的所有VM創建CPU10分鐘之內大于80便發郵件給abc@abc.com的alert，則可以按照以下方式運行

?.\Create-AzureAlert.ps1 -RGName mxytest -MailAddress "abc@abc.com" -Metric CPU -Operation GreaterThan -Threshold 80 -TimeAggregationOperator Average -WindowSize "00:10:00"

創建完成后即可在alert中國看到對應的內容

Get-AzureRmAlertRule -ResourceGroupName mxytest -WarningAction SilentlyContinue

也可以通過PowerShell獲取到信息