It&#x27;s built into GitLab itself, it&#x27;s not an external tool you can install without using GitLab. Some information about it can be found at <a href="http:&#x2F;&#x2F;doc.gitlab.com&#x2F;ce&#x2F;development&#x2F;profiling.html#sherlock" rel="nofollow">http:&#x2F;&#x2F;doc.gitlab.com&#x2F;ce&#x2F;development&#x2F;profiling.html#sherlock</a>.