Merge pull request #7220 from lgayhardt/patch-85

freshness

Author: prmerger-automator[bot]

articles/ai-foundry/how-to/flow-bulk-test-evaluation.md

@@ -9,7 +9,7 @@ ms.custom:
   - build-2024
   - hub-only
 ms.topic: how-to
-ms.date: 5/21/2024
+ms.date: 9/22/2025
 ms.reviewer: none
 ms.author: lagayhar
 author: lgayhardt
@@ -88,6 +88,13 @@ In the run detail page, you can select **Details** to check the details of this
 
 This will firstly direct you to the **Output tab** to view the inputs and outputs line by line. The output tab page displays a table list of results, including the **line ID**, **input**, **output**, **status**, **system metrics**, and **created time**.
 
+Tracing is disabled by default, to enable tracing you need to set the environment variable `PF_DISABLE_TRACING` to `false`. One way you can do this is by adding the following to the python node:
+
+```python
+import os
+os.environ["PF_DISABLE_TRACING"] = "false"
+```
+
 For each line, selecting **View trace** allows you to observe and debug that particular test case in its trace detailed page.
 
 :::image type="content" source="../media/prompt-flow/batch-run-evaluate/batch-run-output.png" alt-text="This screenshot shows the batch run output." lightbox="../media/prompt-flow/batch-run-evaluate/batch-run-output.png":::