在 Azure Log Analytics 中尋找高 CPU 流程

Question

我在 Log Analytics 中建立了以下警報。該警報旨在獲取過去 10 分鐘內 _Total CPU 使用率超過 90% 的所有電腦。但是，當我運行警報時，出現錯誤：

“join”運算子：無法解析名為“FindCPU”的表或清單達式

有人可以讓我知道解決這個問題可能需要什麼嗎？

//Find Top processes utilizing CPU
// by finding the machine(s) using over 90% of CPU
// then finding the processes using the CPU
// also finding CPU count of the machines to find the actual percentage of CPU being used

//defining our CPU threshold
let CPUThreshold = 90;

//define time sample rate
let Time = 10m;

//define Count of processes to return
let Count = 5;

//Find instances of total cpu being used above 90% over the last 10 minutes
let TopCPU = Perf
| where TimeGenerated > now(-Time)
              and ObjectName == "Processor"
              and CounterName == "% Processor Time"
              and InstanceName == "_Total"
              and CounterValue > CPUThreshold
| project Computer, ObjectName
              , CounterName, CounterValue
              , TimeGenerated;
//end query

// find top Processes, excluding _Total and Idle instances, there may be other instances you want to exclude as well
let TopProcess = Perf
| where TimeGenerated > now(-Time)
               and CounterName == "% Processor Time"
               and InstanceName != "_Total"
               and InstanceName != "Idle"
| project Computer, ObjectName
              , CounterName, InstanceName
              , CounterValue, TimeGenerated;
// end query

// find CPU count for servers(s)
let FindCPU = Perf
| where TimeGenerated >= ago(1h)
| where ObjectName == "Processor"
              and CounterName == "% Processor Time"
              and InstanceName!="_Total"
| sort by InstanceName asc nulls first
| summarize CPUCount = dcount(InstanceName) by Computer;
// end query

//Join all 3 datasets together
FindCPU | join(TopCPU) on Computer 
| join(TopProcess)on Computer
| extend PercentProcessorUsed = CounterValue1 / CPUCount
| summarize avg(PercentProcessorUsed) by Computer, ObjectName
                  , CounterName, CPUCount 
                  , TotalCPU=CounterValue //rename CounterValue to TotalCPU 
                  , Process=ObjectName1 //rename ObjectName1 to Process 
                  , ProcessTime=CounterName1 //rename CounterName1 to ProcessTime 
                  , ProcessName=InstanceName //rename InstanceName to ProcessName 
                  , TimeGenerated
| where Process == "Process"
and avg_PercentProcessorUsed > 25 // only return processes that are using more than 25%
| top Count by avg_PercentProcessorUsed desc
| project Computer, CPUCount
                , ProcessName , avg_PercentProcessorUsed
                , TotalCPU, Process
                , ProcessTime, TimeGenerated

謝謝

Answer 1

這個查詢運作良好（儘管對於您想要執行的操作似乎有點過於複雜），但是，您需要確保在運行它時選擇所有查詢。

預設情況下，如果遊標位於所有查詢的末尾，Log Analytics 將只執行最後一個查詢，這顯然會出錯，因為它找不到「FindCPU」。突出顯示所有內容，然後運行它，效果很好。