Documentation for JIRA 6.3. Not using this? See below:
(JIRA 6.2.x documentation | JIRA Cloud documentation | earlier versions of JIRA)

Title: Adding the Issue Statistics Gadget  
Author: admin Apr 17, 2009
Last Changed by: Susan Griffin [Atlassian] May 09, 2013
Tiny Link: (useful for email) https://confluence.atlassian.com/x/CgISCw
Export As: Word  
Incoming Links
Gadgets and Dashboards 3.0 (1)
    Page: All Atlassian Gadgets
Gadgets and Dashboards 2.0 (1)
    Page: All Atlassian Gadgets
JIRA 6.3 (4)
    Page: Single Level Group By Report
    Page: Labeling an Issue
    Page: __gadgets_summary
    Page: Tips of the Trade
JIRA 5.1 (1)
    Page: Tips of the Trade
JIRA 5.0 (1)
    Page: Tips of the Trade
Hierarchy
Parent Page
    Page: Customizing the Dashboard
Labels
Outgoing Links
JIRA 6.3 (5)     Page: What is a Project
    Page: Adding the Issue Statistics Gadget
    Page: Using Filters
    Page: What is an Issue
    Page: Customizing the Dashboard