sanchaz

**Describe the bug** "scheduler_executor should only be used with a custom scheduler." **To Reproduce** Init with no scheduler and no scheduler_executor Sample code is welcome! **Expected behavior** Expected no warning...

Add API Key without key management permissions

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## Change Summary This change adds an example and explanation of a Admin Key without key management permissions. Such a key might be useful for backend services. ## PR Checklist...

Browsable API crashes on extra action in viewset.

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## Checklist - [ X ] I have verified that that issue exists against the `master` branch of Django REST framework. - [ X ] I have searched for similar...