How do I show a percentage as a Metric in Kibana?
<p>I have data that has this format:</p>

<pre><code>{
    "area": "cats",
    "healthy": true,
    "timestamp": "2016-02-12T14:00:00.601000",
}

{
    "area": "dogs",
    "healthy": false,
    "timestamp": "2016-02-12T15:00:00.601000",
}
</code></pre>

<p>As you can see, 'healthy' can be true or false. I want to show the percentage of all records where healthy:true as a Metric in Kibana. I've been trying for several days with no success. It feels like it should be incredibly easy, especially as the pie chart displays it when I hover over it.</p>

<p><a href="https://i.stack.imgur.com/YAMOV.png" rel="noreferrer"><img src="https://i.stack.imgur.com/YAMOV.png" alt="enter image description here"></a></p>

<p>Can you help?</p>

<p>Thanks,
Andy</p>