更新为OMS新查询语言后的Powershell Runbook错误

Question

事实证明，在OMS中迁移到New Query Language之后，WebhookData结构的警报也发生了变化。

我试图更改我的powershell脚本（通过自动化帐户Runbook调用OMS警报），它本地适用于我为某些先前（更新的）警报复制的输入，但我无法在自动化帐户中使用它。

任何人都可以告诉为什么这在Runbook中不起作用但在本地工作？

这是我的Runbook输入：https://jsonblob.com/adf5e1c2-c948-11e7-af9e-2d30dd548850

我从这里拿走了它：

脚本：

$WebhookData = '{"WebhookName":"OMS Alert Remediation b64051e5-b9c5-44db-b74f-51d7cf5a9df2","RequestBody":"{\"WorkspaceId\":\"8547d992-7979-46d0-912b-8fffeabe1c8b\",\"AlertRuleName\":\"SRVR slow response - TEST\",\"SearchQuery\":\"ApplicationInsights | where TelemetryType == \\\"Request\\\" and Computer startswith_cs \\\"SRVR\\\" and Computer != \\\"SRVR-DEVEL\\\" | summarize AggregatedValue = avg(RequestDuration) by bin_at(TimeGenerated, 4m, datetime(2017-11-12T10:32:00.0000000)), Computer | sort by TimeGenerated desc\",\"SearchResult\":{\"tables\":[{\"name\":\"PrimaryResult\",\"columns\":[{\"name\":\"TimeGenerated\",\"type\":\"datetime\"},{\"name\":\"Computer\",\"type\":\"string\"},{\"name\":\"AggregatedValue\",\"type\":\"real\"}],\"rows\":[[\"2017-11-12T10:28:00Z\",\"SRVR-06\",1535.2852333333333],[\"2017-11-12T10:24:00Z\",\"SRVR-06\",718.91287857142856]]}]},\"SearchIntervalStartTimeUtc\":\"2017-11-12T10:27:00Z\",\"SearchIntervalEndtimeUtc\":\"2017-11-12T10:32:00Z\",\"AlertThresholdOperator\":\"Greater Than\",\"AlertThresholdValue\":700,\"ResultCount\":2,\"SearchIntervalInSeconds\":300,\"LinkToSearchResults\":\"https://8547d992-7979-46d0-912b-8fffeabe1c8b.portal.mms.microsoft.com/#Workspace/search/index?_timeInterval.intervalEnd=2017-11-12T10%3a32%3a00.0000000Z&_timeInterval.intervalDuration=300&q=ApplicationInsights%20%20%7C%20where%20TelemetryType%20%3D%3D%20%5C%22Request%5C%22%20and%20Computer%20startswith_cs%20%5C%22SRVR%5C%22%20and%20Computer%20!%3D%20%5C%22SRVR-DEVEL%5C%22%20%20%7C%20summarize%20AggregatedValue%20%3D%20avg(RequestDuration)%20by%20bin_at(TimeGenerated%2C%204m%2C%20datetime(2017-11-12T10%3A32%3A00.0000000))%2C%20Computer%20%20%7C%20sort%20by%20TimeGenerated%20desc\",\"Description\":\"W runbook-u testujemy powershell workflow, zamiast powershel script \",\"Severity\":\"Critical\"}","RequestHeader":{"Connection":"Keep-Alive","Accept":"application/json","Host":"s2events.azure-automation.net","User-Agent":"OMS-Remediation","x-ms-request-id":"9be297e0-c196-45c0-ad23-3b513e165648"}}'

$Input = ConvertFrom-Json $WebhookData
$RequestBody = ConvertFrom-Json -InputObject $Input.RequestBody

$Computers = New-Object -TypeName System.Collections.ArrayList

foreach($row in $RequestBody.SearchResult.tables[0].rows)
{
    $Computers.Add($row[1]) > $null
}

foreach ($Computer in $Computers | Get-Unique)
{
    'Computer: ' + $Computer
    Invoke-Command -Credential $c -ComputerName $Computer -ScriptBlock {
        $date = Get-Date | Out-File -Append 'C:\tmp\test_log.txt' 
    }
} 

这些是Azure门户中的错误：

1.

ConvertFrom-Json : Invalid JSON primitive: .
At line:9 char:10
+ $Input = ConvertFrom-Json $WebhookData
+          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [ConvertFrom-Json], ArgumentException
    + FullyQualifiedErrorId : System.ArgumentException,Microsoft.PowerShell.Commands.ConvertFromJsonCommand

2.

ConvertFrom-Json : Cannot bind argument to parameter 'InputObject' because it is null.
At line:10 char:46
+ $RequestBody = ConvertFrom-Json -InputObject $Input.RequestBody
+                                              ~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [ConvertFrom-Json], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.ConvertFromJs
onCommand

3.

Cannot index into a null array.
At line:14 char:17
+ foreach($row in $RequestBody.SearchResult.tables[0].rows)
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : NullArray

Answer 1

您注意到查询语言已更改。我们在这里发布了一个关于如何解析新语言结果的新示例。

看这里：

https://docs.microsoft.com/en-us/azure/log-analytics/log-analytics-alerts-actions#webhook-actions

查看新示例，看看是否可以使用它来解析记录。

谢谢，Anirudh