先觉条件
使用Azure Monitor监控系统的内存资源使用率的先觉条件我们已经在之前的文章中和大家聊过，具体大家可以参考如下博客：
https://blog.51cto.com/wuyvzhang/2472792
查询收集到的数据
我们可以使用如下查询语句，查询内存剩余内存小于1024MB的服务器：
let setMBValue = 1024;
let startDate = ago(12h);
// enter how many days/hours to look back on
Perf
| where TimeGenerated > startDate
| where ObjectName == "Memory" and CounterName == "Available MBytes Memory" and Computer in ((Heartbeat
| distinct Computer))
| extend FreeMemory = CounterValue
| summarize FreeMemoryMB = min(FreeMemory) by Computer
| where FreeMemoryMB < setMBValue
| summarize max(FreeMemoryMB) by Computer
| join
(
Perf
| where TimeGenerated > startDate
| where ObjectName == "Memory" and CounterName == "Available MBytes Memory" and Computer in ((Heartbeat
| distinct Computer))
| extend FreeMemory = CounterValue
)
on Computer
| make-series Free_Memory_MB = min(FreeMemory) on TimeGenerated from ago(8h) to now() step 2h by Computer
| render timechart
创建Alert
如果我们想要设置邮件，短信等报警规则，可以通过“+ New alert rule”来创建：
创建完成Alert以后，当系统的可用内存低于1024MB时，我们就会收到警报：
将性能图表固定到仪表板
统一我们也可以通过点击查询窗口右上方的“固定”按钮，然后选择我们要将图标展示在那个Dashboard，来将查询结果展示到Azure Dashboard：
原文：https://blog.51cto.com/wuyvzhang/2472807