doc/glossary.rst: add "Dashboard Plugin"

Add an entry below the (Mimic-era and therefore outdated but
nonetheless historically important) Dashboard Plugin key word in the
glosssary, which before now had never been added to the glossary.

Signed-off-by: Zac Dover <zac.dover@proton.me>
(cherry picked from commit a1cec3de5704cedd7f7c8ce185144a96d72520d3)

diff --git a/doc/glossary.rst b/doc/glossary.rst
index 8e8a6d9852240295b92545a2b1cd8a7290703d08..a23c01a32c7af0bcabcf08ca6afd726234778a1e 100644 (file)
--- a/doc/glossary.rst
+++ b/doc/glossary.rst
@@ -261,6 +261,17 @@
                 Another name for :term:`Dashboard`.
 
        Dashboard Plugin
+                The dashboard plugin was a Mimic-era web application that
+                visualized information and statistics about the Ceph cluster
+                using a web server hosted by the :ref:`Ceph
+                Manager<ceph-manager-daemon>`.
+
+                See `the Mimic-era Dashboard Plugin documentation
+                <https://docs.ceph.com/en/mimic/mgr/dashboard/>`_.
+
+        DC
+                **D**\ata **C**\enter.
+
         Flapping OSD
                 An OSD that is repeatedly marked ``up`` and then ``down`` in
                 rapid succession. See :ref:`rados_tshooting_flapping_osd`.