无法查询 AppInsight 日志答案

【问题标题】：Cannot query AppInsight log无法查询 AppInsight 日志
【发布时间】：2021-01-01 17:40:10
【问题描述】：

我正在努力创建 AppInsight 查询...

我想获取应用程序的启动次数并将其除以触发某个事件的次数（拼写检查器）。

实际上，我有 3 个应用程序都使用相同的拼写检查功能，我想看看每个应用程序中拼写检查的使用量是否相同。

//First, let's get the count of hasBeenUsed (how many times the application has been used) 
let app1Starts =
customEvents
| where timestamp > ago(30d)
| where name == 'hasBeenUsed';
| where customDimensions['payload.appId] == 'app1'
| summarize count(); 
//Now, let's get the count of how many times spellchecking has happened for that specific application
let spellCheckEvents =
customEvents
| where timestamp > ago(30d)
| where name == 'spellchecked';
| where customDimensions['payload.appId] == 'app1'
| summarize count();
//this is where I struggle
customEvents
| summarize app1Starts / spellCheckEvents    //HELP ME PLEASE

我收到错误消息

“summarize”运算符：无法解析名为“app1Starts”的标量表达式

如果我将最后一行从 summarize 更改为 extend，也会发生同样的情况

【问题讨论】：

标签： azure azure-application-insights

【解决方案1】：

您可以在 let 语句中使用toscalar() 运算符。

在您的情况下，查询应该是：

//First, let's get the count of hasBeenUsed (how many times the application has been used) 
let app1Starts =toscalar(
customEvents
| where timestamp > ago(30d)
| where name == 'hasBeenUsed'
| where customDimensions['payload.appId] == 'app1'
| summarize count()); 

//Now, let's get the count of how many times spellchecking has happened for that specific application
let spellCheckEvents =toscalar(
customEvents
| where timestamp > ago(30d)
| where name == 'spellchecked'
| where customDimensions['payload.appId] == 'app1'
| summarize count());

//then you can use the following statement
customEvents
| extend c1=app1Starts/spellCheckEvents

【讨论】：