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
}