Filter/Sample requests based on captured header value via app insights config using sampling override feature

[kaynat12]

Is your feature request related to a problem? Please describe.
I am using 3.2.11 app insights agent and could capture header values as below in config file,

"preview": {
"captureHttpServerHeaders": {
"requestHeaders": [ "test"] }

I could see that values are stored under custom dimensions as http.request.header.test in requests table

I want to filter out the requests with header 'test' value as true. I tried sampling as below but doesn't seems to work
"sampling": {
"overrides": [{
"attributes": [ {
"key": "http.request.header.test",
"value": "true",
"matchType": "strict"}],
"percentage": 0
}
I tried with key as customDimensions.["http.request.header.test"] also, still same issue.

Describe the solution you would like

1. Need to have a feature to filter requests based on header value via sampling or possible attribute key for it.
2. Any other alternative if above is not possible

[trask]

hi @kaynat12, I would expect the sampling override to work, can you put together a small repro that we can use to troubleshoot / identify the issue?

[kaynat12]

hi @trask , Thank you for the reply, I have created one sample application and have added you for the repository access, could you take a look?

[kaynat12]

hi @trask , could you find any solution?

[trask]

hi @kaynat12! yes, the problem is that http.request.header.* attributes have type of string array, and the sampling overrides only support string attributes. we'll add support for string array soon, hopefully before 3.3.0 is released

[trask]

hi @kaynat12, if you have a chance, give the latest SNAPSHOT build a try:

https://github.com/microsoft/ApplicationInsights-Java/suites/6753934261/artifacts/258125728

[kaynat12]

hi @trask , the sampling is working now, thank you!

[trask]

3.3.0-BETA.2 has been released with this fix