With KUI Tables it was possible to add tooltips to the header cells. This is useful since some columns need to be explained to the user. In APM we have a column called "Impact" with a tooltip saying: Impact shows the most used and slowest endpoints in your service.

Implementation

Edit: Option A was selected as the best solution of the two.

Option A) EuiBasicTable currently only support strings as name. By allowing custom elements, it would be possible to customize the header in a very flexible way:

{
  field: 'impact',
  name: (
    <div>Impact <EuiToolTip content="Help text"/></div>
  ),
  sortable: true,
  dataType: 'number'
}

Option B) Another option is to keep the name field limited to strings, but introduce a tooltip field:

{
  field: 'impact',
  name: 'Impact',
  tooltip: 'Impact shows the most used and slowest endpoints in your service.',
  sortable: true,
  dataType: 'number'
}