<p>By our product's design we would like to disable the scale down in HPA, can it be disabled?</p>

<p>I randomly stumbled upon this post, and it looks like you <em>can</em> disable scaledown.  <a href="https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/" rel="noreferrer">The documentation</a> includes this example at the bottom.  Potentially this feature wasn't available when the question was initially asked.</p>
<blockquote>
<p>The selectPolicy value of Disabled turns off scaling the given
direction. So to prevent downscaling the following policy would be
used:</p>
</blockquote>
<pre><code>behavior:
  scaleDown:
    selectPolicy: Disabled
</code></pre>
