Documentation for JIRA 5.2. Documentation for other versions of JIRA is available too. 
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By default, the amount of gadget on a dashboard has been limit to 20 by default. If you want to change the limit, you can make it to your preferred number:
JIRA 4.3.x and below:
Locate this line:
jira.dashboard.max.gadgets=20
JIRA 4.4.x and above:
Please note that JIRA property no longer set in jira-application.properties since JIRA 4.4. Instead, you have to copy the key, paste it under jira-config.properties with the value. Please refer to this documentation for further information.
Insert the following(eg. set the limit to 30):
jira.dashboard.max.gadgets=30