Cache /api/schema/ endpoint

[mulmat]

NetBox version

v3.7.6

Feature type

Change to existing functionality

Proposed functionality

Add caching on the /api/schema/ endpoint with a sane default (maybe 300 seconds?) and with the possibility to configure it in configuration.py

Use case

Generating openapi schema takes some time, caching it would:

• Decrease response time when doing multiple calls to /api/schema/
• Lower the resources needed from application server (since less openapi schemas will be generated)

Database changes

None

External dependencies

None

[mulmat]

I can own this if accepted

[jeremystretch]

We actually used to cache the schema definition back in ~v2.11 (see #6423 and 257c0af), before we switched from drf-yasg to spectacular. Unfortunately I don't think spectacular offers caching support natively, so we'd have to implement it ourselves.

@mulmat happy to assign this to you to explore options. Let us know what you find!