We’re in the process of migrating SDK Javadocs and Web UI component storybooks to an SDK-specific S3 bucket.
The Javadocs & Notable API Changes and Web UI Component Storybook wiki pages in our GitHub - inductiveautomation/ignition-sdk-examples: Ignition SDK Example Projects repo have been updated accordingly and should steer you right as long as you refer to those pages.
If you have direct bookmarks to old files.inductiveautomation.com/sdk/ URLs, at some point those files will disappear completely in favor of the copies at the new sdk.inductiveautomation.com/ bucket. (See warnings at the bottom of the wiki pages.)
For a time, future 8.1.n release Javadocs and storybooks may “snap back” to the old files.inductiveautomation.com/sdk/ URLs. But again, the wiki pages should be correct at any given time. We should be able to close this gap and get those migrated as well.