Merge pull request #4082

* [DOC-13729]: Document the amount of stats collected by the server

Author: RayOffiah

modules/manage/pages/monitor/monitor-intro.adoc

@@ -5,7 +5,7 @@
 [abstract]
 {description}
 
-This page summarizes the options available for monitoring Couchbase Server; and provides links to more detailed interface-descriptions.
+This page summarizes the options available for monitoring Couchbase Server and provides links to more detailed interface-descriptions.
 
 [#monitoring-with-the-ui]
 == Monitoring with the UI
@@ -15,6 +15,8 @@ Couchbase-Server statistics can be monitored by means of Couchbase Web Console.
 Users with the *Full Admin* or *Bucket Admin* role can assemble statistics as _groups_ of _charts_, on the *Dashboard* of Couchbase Web Console.
 This is visible by default after login; and can at any time be displayed by left-clicking on the *Dashboard* tab, in the left-hand navigation bar:
 
+Note that the UI returns the last 30 days of statistics.
+
 [#access-dashboard]
 image::manage-statistics/DBaccessDB.png[,100,align=left]
 

modules/rest-api/pages/rest-statistics.adoc

@@ -9,6 +9,8 @@
 Metrics are provided for all Couchbase Services, and also for the Cluster Manager and XDCR.
 All metrics can be queried by means of the REST API.
 
+Couchbase Server stores up to 365 days or 1GB of stats, whichever limit occurs first.
+
 For a complete list of available metrics that can be queried, see the xref:metrics-reference:metrics-reference.adoc[Metrics Reference].
 
 The APIs described in this section are listed below.