calendar"/></svg><span>&nbsp;</span>September 28, 2019</span><span> | </span><span title="1575 words"><svg class="icon clock"><use xlink:href="/v1.8/img/icons.svg#clock"/></svg><span>&nbsp;</span>8 minute read</span>
<span>&nbsp;</span>
<span></span></p></div></div><nav class=toc-inlined aria-label="Table of Contents"><div><hr><ol><li role=none aria-label="External and internal services"><a href=#external-and-internal-services>External and internal services</a><li role=none aria-label="What are BlackHole an