doc/glossary.rst: define "Ceph Manager"

Add a definition for Ceph Manager (ceph-mgr).

Signed-off-by: Zac Dover <zac.dover@gmail.com>

diff --git a/doc/glossary.rst b/doc/glossary.rst
index 4dc55aa28d1f5d8f95e64d59809c898c6bc42c94..32a4f7c317d8fb87f839a7c8baea9614c5a835f6 100644 (file)
--- a/doc/glossary.rst
+++ b/doc/glossary.rst
@@ -59,6 +59,12 @@
                 with the Ceph System (for example: ``ceph.ko``, ``rbd.ko``).
 
        Ceph Manager
+                The Ceph manager daemon (ceph-mgr) is a daemon that runs
+                alongside monitor daemons to provide monitoring and interfacing
+                to external monitoring and management systems. Since the
+                Luminous release (12.x), the ceph-mgr daemon is required in
+                order for the Ceph cluster to function properly.
+
        Ceph Manager Dashboard
        Ceph Metadata Server
        Ceph Monitor