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Add an entry below the (Mimic-era and therefore outdated but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 00f1b8f7481f2312eec293365c5e0648845c3c71..a7fb5856b5d3a728895250658a1b291943f83cb7 100644 (file)
--- a/doc/glossary.rst
+++ b/doc/glossary.rst
@@ -261,6 +261,14 @@
                 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.