doc/glossary: add "Period" to glossary

Add definition for "period" to glossary.

Signed-off-by: Zac Dover <zac.dover@proton.me>

diff --git a/doc/glossary.rst b/doc/glossary.rst
index 91cc4b263ad61681c5efc1f4bcbd1c2af2cf1a2e..4d1376623bb0bd3980b9f8bda9f499ef2ed445b3 100644 (file)
--- a/doc/glossary.rst
+++ b/doc/glossary.rst
@@ -274,6 +274,12 @@
                 This is the unique identifier of an OSD. This term is used
                 interchangeably with ``fsid``
 
+        Period
+                In the context of :term:`RGW`, a period is the configuration
+                state of the :term:`Realm`. The period stores the configuration
+                state of a multi-site configuration. When the period is updated,
+                the "epoch" is said thereby to have been changed.
+
        :ref:`Pool<rados_pools>`
                A pool is a logical partition used to store objects.