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<article id="post-551" class="single-view post-551 post type-post status-publish format-standard hentry category-general" itemprop="blogPost" itemscope itemtype="http://schema.org/BlogPosting">
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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-86/">SRE Weekly Issue #86</a></h1>
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<div class="entry-date" itemprop="datePublished" >
<i class="genericon genericon-day"></i><a class="updated" href="https://sreweekly.com/sre-weekly-issue-86/">August 27, 2017</a>
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<a href="https://sreweekly.com/sre-weekly-issue-86/" title="Permalink to SRE Weekly Issue #86" class="email_only">View on sreweekly.com</a>
<div class="sreweekly-sponsor-message" style="border: 1px solid #b0b0b0; padding-left: 1rem; padding-right: 1rem; width: 80%; align: center; margin: 2rem auto 2rem auto;">
<h2 style="text-align: center; font-size: 55%; color: #b0b0b0;">SPONSOR MESSAGE</h2>
<p>More efficiently reach on-call teams and incident responders with a new way to deploy Live Call Routing using Twilio Functions and VictorOps. Check it out:<br />
<a href="http://try.victorops.com/LiveCallRouting/SREWeekly">http://try.victorops.com/LiveCallRouting/SREWeekly</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://opensource.com/article/17/8/testing-production" target="_blank">Testing in production: Yes, you can (and should)</a></div>
<div class="sreweekly-description">
<p>Charity Majors knocks one out of the park with this article on the importance of testing (safely) in production.</p>
<blockquote><p>Why does testing in production get such a bad rap when we all do it? The key is to do it right.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.pagerduty.com/blog/intern-insights-on-call-experience/" target="_blank">Stepping Up to the Plate: A Story About Being On-Call &#8211; PagerDuty</a></div>
<div class="sreweekly-description">
<p>And speaking of baseball metaphors, here&#8217;s a PagerDuty engineer&#8217;s first-person account of shadowing on-call during an incident and the lessons she learned.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.surveymonkey.com/r/devops-retros" target="_blank">Post-Incident Reviews Survey</a></div>
<div class="sreweekly-description">
<p>If you have time, please consider filling out this short survey on post-incident reviews (a.k.a. &#8220;retrospectives&#8221;) as part of a master&#8217;s thesis.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.gremlininc.com/a-primer-on-automating-chaos-84ff4b053be0" target="_blank">A Primer on Automating Chaos – Gremlin, Inc.</a></div>
<div class="sreweekly-description">
<p>Mathias Lafeldt of Gremlin Inc. gives us this tutorial on moving from hand-run chaos experiments to a fully automated chaos system.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://victorops.com/blog/post-incident-reviews-learning-from-failure-for-improved-incident-response/" target="_blank">Post-Incident Reviews: Learning from Failure for Improved Incident Response &#8211; VictorOps</a></div>
<div class="sreweekly-description">
<p>Recently, Jason Hand&#8217;s new ebook, <a href="https://victorops.com/oreilly-post-incident-review/">Post-Incident Reviews</a>, was published. Here&#8217;s his summary of the key points in the first three chapters.</p>
<p><small><em>This article is published by my sponsor, VictorOps, but their sponsorship did not influence its inclusion in this issue.</em></small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://www.corriganjc.net/2017/07/designing-operational-metrics-for.html?m=1" target="_blank">Operational Metrics and Alerts for Distributed Software Systems</a></div>
<div class="sreweekly-description">
<p>This article describes metrics in three main categories and explains how (and whether) to set up alerts for each kind.</p>
<blockquote><p>Good output metrics are a close proxy for dollars earned or saved by the system per minute.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.pagerduty.com/blog/cutting-alert-fatigue-modern-ops/" target="_blank">Cutting Alert Fatigue in Modern Ops &#8211; PagerDuty</a></div>
<div class="sreweekly-description">
<p>Like the previous article, Ilan Rabinovitch of Datadog advocates for symptom-based monitoring and alerting. I like his concept of the improved &#8220;durability&#8221; of symptom-based alerting (as opposed to cause-based):</p>
<blockquote><p>[&#8230;] you don’t have to update your alert definitions every time your underlying system architectures change.</p></blockquote>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/production-ready/impermanence-the-single-root-cause-bd9ebadf1e8e" target="_blank">Impermanence: The Single Root Cause – Production Ready</a></div>
<div class="sreweekly-description">
<p>Our systems are always in flux, and this sometimes leads to failure. Mathias expands on this line of thinking to urge seeking to understand the many conditions that led to a failure, rather than a particular root cause.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.hostedgraphite.com/2017/08/15/per-metric-rate-limiting-how-we-protect-our-backend/" target="_blank">Per-metric rate limiting: How we protect our backend</a></div>
<div class="sreweekly-description">
<p>Hosted Graphite had a gnarly problem to solve: how to get information about overload conditions from the backend to the front end where throttling could be enacted.</p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://honeycomb.io/blog/2017/08/our-first-outage/">Honeycomb</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Honeycomb suffered their first major outage this week. I&#8217;m impressed by how quickly they were able to diagnose and fix the problem, owing at least in part to their use of their own service during troubleshooting.</li>
</ul>
</li>
<li><a href="https://status.pagerduty.com/incidents/t1vwfnb8bkjj">PagerDuty</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Here&#8217;s a followup from PagerDuty on an incident in May caused by &#8220;unanticipated side-effects of a system-wide load test&#8221;.</li>
</ul>
</li>
<li><a href="https://www.bleepingcomputer.com/news/hardware/botched-firmware-update-bricks-hundreds-of-smart-door-locks/">Botched Firmware Update Bricks Hundreds of Smart Door Locks</a></li>
<li><a href="https://medium.com/synqfm-ops/rca-for-synq-dashboard-login-and-registration-outage-on-august-11th-2017-d86d6dc1ed70?source=rss----c5d5bfbdd67b---4">RCA for SYNQ dashboard login and registration outage on August 11th, 2017</a></li>
<li><a href="https://www.dreamhoststatus.com/pages/history/575f0f606826303142000510">DreamHost</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">DreamHost suffered a couple of DDoS attacks this week.<small><em>Thanks to an anonymous SRE Weekly reader for this one.</em></small></li>
</ul>
</li>
<li><a href="https://www.geo.tv/latest/155414-thousands-unable-to-access-facebook-after-unexplained-outage">Facebook</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Facebook had a couple of outages this week.</li>
</ul>
</li>
</ul>
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