To enable Diagnostics in Oracle apps , for certain users you need to follow these simple steps:

Step 1 :

Navigate to System Administrator responsibility ==> Profile ==> System ==>

Step 2 :

Enter profile name: Utilities:Diagnostics

Enter Application User for whom you want to enable Diagnostics

Step 3 :

Choose “Yes” at User level and Save the Changes

Note :

You can set Yes at Site level also if you want to enable this option for all Oracle application users

Step 4 :

After that navigate to System Administrator responsibility ==> Profile ==> System ==>

Enter profile name: Hide Diagnostics menu entry

Enter Application User for whom you do not want to hide Diagnostics menu entry

Step 5 :

Choose “No” at User level and Save the Changes like below screen.

Congratulations you have successfully enabled Diagnostics like below screen

Hope this help.