英文:
Extract fields from Json using Kusto in Application Insights
问题
以下是您要求的翻译：
I have the following json contained in a particular field in the traces.customDimensions:
当我解析此Json以提取特定值时，我总是得到一个空列，例如：
查询返回以下结果：
我也尝试过：
但在这里，我还得到了一个空的“Source”列。而且“DepthCurrentContext”和“DepthCurrentParentContext”列甚至都不显示。
Json是有效的。
我在这里漏掉了什么吗？
任何帮助都会非常感激！
更新 2023年2月27日
当我执行以下操作时：
我从Json中获取了属性。这个Json与日志中的Json完全相同。
有什么想法吗？
英文:
I have the following json contained in a particular field in the traces.customDimensions:
When I parse this Json to extract a particular value I always get an empty column, for example:
traces | order by timestamp desc
| project CurrentContext = parse_json(customDimensions.CurrentPluginContext)
| extend Source = CurrentContext.source
| project Source
The query returns the following:
I've also tried:
traces | order by timestamp desc
| project timestamp, CurrentContext = customDimensions.CurrentPluginContext, CurrentParentContext = customDimensions.CurrentParentluginContext,
Source = parse_json(tostring(customDimensions.CurrentPluginContext)).source,
DepthCurrentContext = parse_json(tostring(customDimensions.CurrentPluginContext)).depth,
DepthCurrentParentContext = parse_json(tostring(customDimensions.CurrentParentluginContext)).depth
| mv-expand CurrentContext
| extend Source = CurrentContext.source
But here I get also an empty "Source" column. And the Columns "DepthCurrentContext" and "DepthCurrentParentContext" do not even appear.
The Json is valid.
Do I miss something here?
Any help is very appreciated!
UPDATE 27.02.2023
When I do the following:
let json = '{"source": "GetUserData","correlationId": "00000000-0000-0000-0000-000000000000","depth": "1","initiatingUserId": "00000000-0000-0000-0000-000000000000","isInTransaction": "False","isolationMode": "2","message": "Update","mode": "Asynchronus","operationId": "00000000-0000-0000-0000-000000000000","orgId": "00000000-0000-0000-0000-000000000000","orgName": "unqXXXXXXXXXXXXXXXXXXXX","requestId": "00000000-0000-0000-0000-000000000000","userId": "00000000-0000-0000-0000-000000000000","entityId": "00000000-0000-0000-0000-000000000000","entityName": "systemuser","type": "Plugin","stage": "Post-operation"}';
traces
| extend properties = parse_json(json)
| project Source = properties.source, CorrelationID = properties.correlationId
I get the properties out of the Json. The Json is the exact same as the ohne from the log.
Any idea?
答案1
得分: 3
如文档中所述1：您需要在内部属性包上使用tostring。
即parse_json(tostring(parse_json(customDimensions).CurrentPluginContext))。
英文:
as mentioned in the documentation: you will need to use tostring on the internal property bag.
i.e. parse_json(tostring(parse_json(customDimensions).CurrentPluginContext))
答案2
得分: 0
traces | 按时间戳降序排序
| 提取 CurrentContext = 解析为 JSON 的 customDimensions.CurrentPluginContext
| 扩展 Source = 解析为 JSON 的 tostring(CurrentContext)).source
| 提取 Source
英文:
traces | order by timestamp desc
| project CurrentContext = parse_json(customDimensions.CurrentPluginContext)
| extend Source = parse_json(tostring(CurrentContext)).source
| project Source
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