Unfortunately, I think your wiki page not being shown in the Update
Centre is the least of the worries we have here.
You have named a plugin "sample" and used that as your plugin ID, even
although it's not sample code, and the plugin "notifies messages" but
doesn't say what type of messages.
From looking at the code, you've written a HipChat notifier, even
although there is clearly already a HipChat plugin for Jenkins, which
was created years ago:
https://wiki.jenkins-ci.org/display/JENKINS/HipChat+Plugin
There are a 1001 things wrong with the code and the git repo, including
broken config screens, binaries and other irrelevant files checked in,
missing release commits/tags, two copies of the source tree, bizarre
usage of the
developer.id field in the pom.xml...
Please do not create any more plugin releases for this repository, and
for now I have tagged the wiki page with "plugin-deprecated" to prevent
this from appearing in the update centre. Preferably, we would delete
the wiki page.
If you want to use your plugin yourself, you can install it directly to
your Jenkins instance via the plugin manager; it's not necessary to host
every plugin in the update centre.
If you wish to contribute pull requests to the HipChat plugin, feel
free, but please do not make any further plugin releases directly
without gaining some more experience with Java development, Jenkins and Git.
StackOverflow.com is a good place to get help on these topics, or this
mailing list for specific plugin-related questions.
Thanks,
Chris