[Enhancement/Support] HTTP feature "Transition feature for backward compatibility"

[pgfeller]

I've noted, that with a new OH 4.2 installation the http karaf feature is not part of the default setup anymore:

http | 8.0.27 | | Uninstalled | standard-4.4.6 | Transition feature for backward compatibility

As the feature is marked as transitional it might be a documentation issue after all (then please transfer to doc repository - and I'll follow up). I use http to make my interactive grafana charts available to OH phone/remote application:

openhab> http:proxy-list                                                                                                                                                                                                       
URL      │ ProxyTo                                  │ Balancing Policy
─────────┼──────────────────────────────────────────┼─────────────────
/grafana │ https://openhab.home:3000/grafana │

Of course this needs proper SSL setup etc. to work - but might be worth a docu page as well ...

Environment

Clean installation of OH 4.2:

Installation (📦 Docker container)

                           _   _     _     ____  
   ___   ___   ___   ___  | | | |   / \   | __ ) 
  / _ \ / _ \ / _ \ / _ \ | |_| |  / _ \  |  _ \ 
 | (_) | (_) |  __/| | | ||  _  | / ___ \ | |_) )
  \___/|  __/ \___/|_| |_||_| |_|/_/   \_\|____/ 
       |_|       4.2.0 - Release Build
Use '' for a list of available commands
and '[cmd] --help' for help on a specific command.
To exit, use '' or 'logout'.
openhab> info
Karaf
Karaf version               4.4.6
Karaf home                  /openhab/runtime
Karaf base                  /openhab/userdata
OSGi Framework              org.eclipse.osgi-3.18.0.v20220516-2155
JVM
Java Virtual Machine        OpenJDK 64-Bit Server VM version 17.0.11+9-Debian-1deb11u1
Version                     17.0.11
Vendor                      Debian
Pid                         203
Uptime                      2 hours 35 minutes
Process CPU time            3 minutes
Process CPU load            0.00
System CPU load             0.12
Open file descriptors       203
Max file descriptors        1,048,576
Total compile time          1 minute
Threads
Live threads                118
Daemon threads              58
Peak                        202
Total started               3114
Memory
Current heap size           276,990 kbytes
Maximum heap size           4,005,888 kbytes
Committed heap size         475,136 kbytes
Pending objects             0
Garbage collector           Name = 'G1 Young Generation', Collections = 36, Time = 0.434 seconds
Garbage collector           Name = 'G1 Old Generation', Collections = 0, Time = 0.000 seconds
Classes
Current classes loaded      20,045
Total classes loaded        20,223
Total classes unloaded      178
Operating system
Name                        Linux version 6.5.0-44-generic
Architecture                amd64
Processors                  8
Total physical memory       16,019,212 kbytes
Free physical memory        741,408 kbytes

Expected Behavior

➡️ for 4.2 this is not an issue, as I can install the transition http feature manually; but it would be great if the proxy feature would be part of the default installation.

Information about the current way to do this would be appreciated as well. If desired I can then open a documentation issue and create docu about that feature - as in my opinion it is very powerful to integrate grafana, frontail, etc ... into the UI (using the interactive grafana widgets).