Jenkins infrastructure is continuously improving.
The latest service to get some attention and major improvement is the Jenkins javadoc.
There were a number of issues affecting that service:
Irregular updates -
Developers wouldn’t find the latest java documentation because of inadequate update frequence.
Broken HTTPS support -
when users would go to the Javadoc site they would get an unsafe site warning and then an incorrect redirection.
Obsolete content - Javadoc...
Java 11 Support preview.
We will show how to run Jenkins with Java 11, discuss known compatibility issues, and explain how to investigate and report any issues you find.
Austin JAM: Jenkins Performance Tuning and Troubleshooting
Continuous Integration with Blue Ocean
First Montreal Jenkins Area Meetup