doc/glossary: add "Prometheus"

Add a glossary entry for "Prometheus".

Co-authored-by: Anthony D'Atri <anthony.datri@gmail.com>
Signed-off-by: Zac Dover <zac.dover@proton.me>
(cherry picked from commit 1a76464999cb2d2cc748d69e1bb0567544a0bb8b)

diff --git a/doc/glossary.rst b/doc/glossary.rst
index 5e1e3b6f1743b9a672d45f265bdeac411f1e786b..a0de645cbfc3d6e65881647d2a7dc960db17cf62 100644 (file)
--- a/doc/glossary.rst
+++ b/doc/glossary.rst
@@ -397,6 +397,12 @@
                 Firefly (v. 0.80). See :ref:`Primary Affinity
                 <rados_ops_primary_affinity>`.
 
+        :ref:`Prometheus <mgr-prometheus>`
+                An open-source monitoring and alerting toolkit. Ceph offers a
+                :ref:`"Prometheus module" <mgr-prometheus>`, which provides a
+                Prometheus exporter that passes performance counters from a
+                collection point in ``ceph-mgr`` to Prometheus.
+
         Quorum 
                 Quorum is the state that exists when a majority of the
                 :ref:`Monitors<arch_monitor>` in the cluster are ``up``. A