Compartilhar via

包含 ADX 和 ARG 的示例日志搜索警报查询

日志搜索警报规则通过使用 Log Analytics 查询以设置频率评估日志来监视资源。 可以在日志搜索警报规则查询中包含来自 Azure 数据资源管理器和 Azure Resource Graph 的数据。

本文提供了使用 Azure 数据资源管理器和 Azure Resource Graph 的日志搜索警报规则查询的示例。 有关创建日志搜索警报规则的详细信息，请参阅创建日志搜索警报规则。

检查虚拟机运行状况的查询

此查询发现标记为“关键”的虚拟机，这些虚拟机在过去 2 分钟内没有检测信号。

    arg("").Resources
    | where type == "microsoft.compute/virtualmachines"
    | summarize LastCall = max(case(isnull(TimeGenerated), make_datetime(1970, 1, 1), TimeGenerated)) by name, id
    | extend SystemDown = case(LastCall < ago(2m), 1, 0)
    | where SystemDown == 1

此查询发现标记为“关键”的虚拟机在 24 小时前有检测信号，但在过去 2 分钟内没有检测信号。

{
    arg("").Resources
    | where type == "microsoft.compute/virtualmachines"
    | where tags.BusinessCriticality =~ 'critical' and subscriptionId == '123-456-123-456'
    | join kind=leftouter (
    Heartbeat
    | where TimeGenerated > ago(24h)
    )
    on $left.name == $right.Resource
    | summarize LastCall = max(case(isnull(TimeGenerated), make_datetime(1970, 1, 1), TimeGenerated)) by name, id
    | extend SystemDown = case(LastCall < ago(2m), 1, 0)
    | where SystemDown == 1
}

用于筛选需要监视的虚拟机的查询

   {
    let RuleGroupTags = dynamic(['Linux']);
    Perf | where ObjectName == 'Processor' and CounterName == '% Idle Time' and (InstanceName in ('_Total,'total'))
    | extend CpuUtilisation = (100 - CounterValue)   
    | join kind=inner hint.remote=left (arg("").Resources
        | where type =~ 'Microsoft.Compute/virtualMachines'
    | project _ResourceId=tolower(id), tags) on _ResourceId
    | project-away _ResourceId1
    | where  (tostring(tags.monitorRuleGroup) in (RuleGroupTags)) 
}

查询，查找将在 30 天内过期的证书的资源

{
    arg("").Resources
    | where type == "microsoft.web/certificates"
    | extend ExpirationDate = todatetime(properties.expirationDate)
    | project ExpirationDate, name, resourceGroup, properties.expirationDate
    | where ExpirationDate < now() + 30d
    | order by ExpirationDate asc
}

查询，会在订阅中创建新资源时发出警报

{
    arg("").resourcechanges
    | extend changeTime = todatetime(properties.changeAttributes.timestamp), 
    changeType = tostring(properties.changeType),targetResourceType = tostring(properties.targetResourceType),
    changedBy = tostring(properties.changeAttributes.changedBy),
    createdResource = tostring(properties.targetResourceId)
    | where changeType == "Create" and changeTime <ago(1h)
    | project changeTime,createdResource,changedBy

}

后续步骤