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Azure Functions does not support DiagnosticListener callbacks when using System.Diagnostics.DiagnosticSource (> 4.7.0)

See original GitHub issue

DiagnosticListener callbacks are not called in Function apps when using System.Diagnostics.DiagnoticSource (> 4.7.0)

Investigative information

Tried this locally

Repro steps

Clone this repo: https://github.com/utpilla/AzureFunctions-DiagnosticSource/tree/DiagnosticSource_5.0.1 and switch to branch DiagnosticSource_5.0.1
Run the AzureFunctions-DiagnosticSource project
Make an HTTP GET request to http://localhost:7071/api/HttpHandlerDiagnosticListener

Expected behavior

Response should be:

[
    "System.Net.Http.HttpRequestOut.Start",
    "System.Net.Http.Request",
    "System.Net.Http.HttpRequestOut.Stop",
    "System.Net.Http.Response"
]

This is a list of events that are logged by HttpClient when making an outbound Http request

Actual behavior

Response is empty

Known workarounds

Revert the System.Diagnostics.DiagnosticSource package version to 4.7.0

Related information

It works correctly with the main branch as it’s using System.Diagnostics.DiagnosticSource (= 4.7.0)
Programming language used: C#
Links to source: https://github.com/utpilla/AzureFunctions-DiagnosticSource/tree/main

Issue Analytics

State:
Created 3 years ago
Comments:8 (5 by maintainers)

Top GitHub Comments

2reactions

RohitRanjanMScommented, Jan 21, 2022

@utpilla this is working in V4, we can close this issue. @brettsam @fabiocav FYI

1reaction

fabiocavcommented, Sep 22, 2021

We need to track the unification change in 4.0.

Tagging @brettsam for validation in v4

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