deprecate pywikibot.version.get_toolforge_hostname()

With SGE being removed, the k8s hostname is not relevant

Change-Id: Ia81f58bf47fdf7ecc2f53c602cc3b1ab157d6764
---
M pywikibot/version.py
M ROADMAP.rst
M pywikibot/scripts/version.py
3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/ROADMAP.rst b/ROADMAP.rst
index 0f5d08a..5026fdf 100644
--- a/ROADMAP.rst
+++ b/ROADMAP.rst
@@ -36,6 +36,7 @@
 Deprecations
 ------------
 
+* 9.0.0: ``pywikibot.version.get_toolforge_hostname()`` is deprecated without replacement
 * 9.0.0: ``iteritems`` method of :class:`data.api.Request` will be removed in favour of ``items``
 * 9.0.0: ``SequenceOutputter.output()`` is deprecated in favour of :attr:`tools.formatter.SequenceOutputter.out` property
 * 9.0.0: *nullcontext* context manager and *SimpleQueue* queue of :mod:`backports` are derecated
diff --git a/pywikibot/scripts/version.py b/pywikibot/scripts/version.py
index be51af8..9e1f129 100755
--- a/pywikibot/scripts/version.py
+++ b/pywikibot/scripts/version.py
@@ -16,7 +16,7 @@
 import sys
 
 import pywikibot
-from pywikibot.version import get_toolforge_hostname, getversion
+from pywikibot.version import getversion
 
 
 class DummyModule:
@@ -80,10 +80,6 @@
 
     pywikibot.info('Python: ' + sys.version)
 
-    toolforge_env_hostname = get_toolforge_hostname()
-    if toolforge_env_hostname:
-        pywikibot.info('Toolforge hostname: ' + toolforge_env_hostname)
-
     # check environment settings
     settings = {key for key in os.environ if key.startswith('PYWIKIBOT')}
     settings.update(['PYWIKIBOT_DIR', 'PYWIKIBOT_DIR_PWB',
diff --git a/pywikibot/version.py b/pywikibot/version.py
index 318468b..ae872d9 100644
--- a/pywikibot/version.py
+++ b/pywikibot/version.py
@@ -26,16 +26,19 @@
 from pywikibot.backports import cache
 from pywikibot.comms.http import fetch
 from pywikibot.exceptions import VersionParseError
+from pywikibot.tools import deprecated
 
 
 def _get_program_dir() -> str:
     return os.path.normpath(os.path.split(os.path.dirname(__file__))[0])
 
 
+@deprecated(since='9.0.0')
 def get_toolforge_hostname() -> str | None:
     """Get hostname of the current Toolforge host.
 
     .. versionadded:: 3.0
+    .. deprecated:: 9.0
 
     :return: The hostname of the currently running host,
              if it is in Wikimedia Toolforge; otherwise return None.

