ambari/ambari-web/app/templates/common/time_range_list.hbs

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<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" rel="tooltip" {{bindAttr data-original-title="view.parentView.tooltipMessage"}}>
  {{view.parentView.currentTimeRange.name}}{{#if view.parentView.isCustomTimeRange}}: {{view.parentView.customStartTimeFormatted}}{{/if}} &nbsp;<span class="caret"></span>
</button>
<ul class="dropdown-menu">
  {{#each option in view.parentView.timeRangeOptions}}
    <li><a href="#" {{action setTimeRange option target="view.parentView"}}>{{option.name}}</a></li>
  {{/each}}
</ul>