The liferay-ui:icon-menu tag is used in many spots throughout the portlet and in most instances of it being used outside the portlet-topper it lacks a tooltip.
Steps to Reproduce:
1. Add a Blogs portlet to a page
2. Add a blogs entry
3. Hover over options menu in the portlet topper (three vertical dots in upper right corner of portlet); the tooltip "Options" will be displayed
4. Hover over secondary menu (second set of vertical dots inline with each Blogs Entry)
There should be a tooltip displayed which lets the user know the purpose of the menu.
No tooltip is displayed.
Do note that there is a large number of uses throughout Liferay's code where liferay-ui:icon-menu is used in the same way and lacks a tooltip.