Allow maxsize to be configured at the global level

- Add tests

Fixes: PROD-36204
Change-Id: If1322ebcfc46cb8622598bc5c14f304793e6ab15
diff --git a/README.rst b/README.rst
index 84984ce..f7318d6 100644
--- a/README.rst
+++ b/README.rst
@@ -64,6 +64,7 @@
           rotate: daily
           keep_rotate: 6
           dateext: true
+          maxsize: 50K
 
 Cross-formula relationship
 ==========================