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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-51/">SRE Weekly Issue #51</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-51/">December 18, 2016</a>
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<a href="https://sreweekly.com/sre-weekly-issue-51/" title="Permalink to SRE Weekly Issue #51" class="email_only">View on sreweekly.com</a>
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<h2>Articles</h2>
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<div class="sreweekly-title"><a href="https://codeascraft.com/2016/11/17/debriefing-facilitation-guide/" target="_blank">Etsy’s Debriefing Facilitation Guide for Blameless Postmortems</a></div>
<div class="sreweekly-description">
<p>This is a big moment for the SRE field. Etsy has distilled the internal training materials they use to teach employees how to facilitate retrospectives (&#8220;debriefings&#8221; in Etsy parlance). They&#8217;ve released a guide and posted this introduction that really stands firmly on its own. I love the real-world story they share.</p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://extfiles.etsy.com/DebriefingFacilitationGuide.pdf" target="_blank">Debriefing Facilitation Guide [PDF]</a></div>
<div class="sreweekly-description">
<p>And here&#8217;s the guide itself. This is essential reading for any SRE interested in understanding incidents in their organization.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.acolyer.org/2016/12/02/slicer-auto-sharding-for-datacenter-applications/" target="_blank">Slicer: Auto-sharding for datacenter applications | the morning paper</a></div>
<div class="sreweekly-description">
<blockquote><p>Slicer is a general purpose sharding service. I normally think of sharding as something that happens within a (typically data) service, not as a general purpose infrastructure service.  What exactly <em>is</em> Slicer then?</p></blockquote>
<p>Click through to find out. It&#8217;ll be interesting to see what open source projects this paper inspires.</p>
</div>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://honeycomb.io/blog/2016/12/the-problem-with-pre-aggregated-metrics-part-2-the-aggregated/" target="_blank">The Problem with Pre-aggregated Metrics: Part 2, the &#8220;aggregated&#8221;</a></div>
<div class="sreweekly-description">
<p>The second in a series, this article delves into the pitfalls of aggregating metrics. Aggregation means you have to choose between bloating your time-series datastore or leaving out crucial stats that you may need during an investigation.</p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://feedproxy.google.com/~r/sysadvent/~3/PzUZ-02cjCM/day-15-take-that-vacation-eliminate.html" target="_blank">sysadvent: Day 15 &#8211; Take That Vacation: Eliminate Alerts Dragging You Back to the Office</a></div>
<div class="sreweekly-description">
<p>I thought this was going to be primarily an argument for reducing burnout to improve reliability. That&#8217;s in there, but the bulk of this article is a bunch of tips and techniques for improving your monitoring and alerting to reduce the likelihood that you&#8217;ll be pulled away from your vacation.</p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://feedproxy.google.com/~r/sysadvent/~3/isXGHmIvSE4/day-17-write-it-down-or-suffer.html" target="_blank">sysadvent: Day 17 &#8211; Write it down or suffer the consequences</a></div>
<div class="sreweekly-description">
<p>The title says it all. Losing the only person with the knowledge of how to keep your infrastructure running is a huge reliability risk. In this article, Heidi Waterhouse (who I coincidentally just met at LISA16!) makes it brilliantly clear why you need good documentation and how to get there.</p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://dzone.com/articles/why-now-is-the-time-to-implement-redundant-dns" target="_blank">Why Now Is the Time to Implement Redundant DNS</a></div>
<div class="sreweekly-description">
<p>Here&#8217;s another overview of implementing a secondary DNS provider. I like that they cover the difficulties that can arise when you use a provider&#8217;s proprietary non-RFC DNS extensions such as weighted round-robin record sets.</p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="http://status.aws.amazon.com">EC2 (us-west-1), Heroku</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">EC2&#8217;s Dublin region had an outage in the DNS resolver provided to instances via DHCP. Heroku was <a href="https://status.heroku.com/incidents/1001">affected</a> as well.<small><em>Full disclosure: Heroku is my employer.</em></small></li>
</ul>
</li>
<li><a href="http://awfulannouncing.com/2016/directv-now-experiences-three-hour-outage-has-further-rsn-issues.html">DirecTV Now</a></li>
<li><a href="http://www.networkworld.com/article/3149576/internet/dns-provider-changeip-cites-mysql-database-crash-for-days-long-outage.html">ChangeIP (DNS provider)</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">ChangeIP tweeted that they suffered a major MySQL failure.</li>
</ul>
</li>
<li><a href="http://theconversation.com/server-down-what-caused-the-ato-systems-to-crash-70396">ATO (Australian Tax Office)</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">The ATO lost a petabyte of data from their HPE 3PAR StoreServe SAN.</li>
</ul>
</li>
<li><a href="http://www.dailystar.co.uk/tech/gaming/569697/PSN-Status-DOWN-PlayStation-Network-not-working-PS4-PS3-PS-Vita-Hacked">PSN</a></li>
<li><a href="https://www.hackread.com/you-are-not-alone-ea-servers-are-down/">Battlefield 1</a></li>
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