I’ll keep it short and simple this time. Here’s a great way to debug your app across multiple App Insights instances.
So, I have two Azure Functions services running, with one serving as an API, and the other serving as BE processing engine. Both report telemetry to App Insights (different apps), and I am passing a context along from one to the other – so I can correlate exceptions and bugs.
Wouldn’t it be great to be able to see what happened in a single session across the 2 apps?
It’s possible – using ‘app‘ – just plugin the name of the app insights resource you want to query, and a simple ‘union‘.
Here you go:
let session="reReYiRu"; union app('FE-prod').traces, app('BE-prod').traces | where session_Id == session | project timestamp, session_Id, appName, message | order by timestamp asc
Don’t forget –
- You can use the field ‘appName‘ to see which app this particular trace is coming from.
- Different machines have different times.. Don’t count on the timestamp ordering to always be correct.