[PATCH] docs: Mark "gluster" support in QEMU as deprecated

[Thomas Huth <thuth@redhat.com>]

According to https://marc.info/?l=fedora-devel-list&m=171934833215726
the GlusterFS development effectively ended. Thus mark it as deprecated
in QEMU, so we can remove it in a future release if the project does
not gain momentum again.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 docs/about/deprecated.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index ed31d4b0b2..b231aa3948 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -395,6 +395,15 @@ Specifying the iSCSI password in plain text on the command line using the
 used instead, to refer to a ``--object secret...`` instance that provides
 a password via a file, or encrypted.
 
+``gluster`` backend (since 9.2)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+According to https://marc.info/?l=fedora-devel-list&m=171934833215726
+the GlusterFS development effectively ended. Unless the development
+gains momentum again, the QEMU project might remove the gluster backend
+in a future release.
+
+
 Character device options
 ''''''''''''''''''''''''
 
-- 
2.46.0