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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-236/">SRE Weekly Issue #236</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-236/">September 20, 2020</a>
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<a href="https://sreweekly.com/sre-weekly-issue-236/" title="Permalink to SRE Weekly Issue #236" 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: 80%; color: #909090;">A message from our sponsor, StackHawk:</h2>
<p>Add application security checks with GitHub actions. Check out the video on how.<br />
<a href="https://www.stackhawk.com/blog/application-security-with-github-actions?utm_source=SREWeekly">https://www.stackhawk.com/blog/application-security-with-github-actions?utm_source=SREWeekly</a></p>
</div>
<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://mads-hartmann.com/2019/03/01/my-first-outage.html" target="_blank">My first outage</a></div>
<div class="sreweekly-description">
<p>A nice juicy post-incident report from the archives. Remember the first time you took down production?</p>
<p><small>Mads Hartmann — Glitch</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.statnett.no/en/about-statnett/news-and-press-releases/news-archive-2020/fault-during-testing-of-nordlink/" target="_blank">Fault during testing of NordLink</a></div>
<div class="sreweekly-description">
<p>While testing a new power transmission link, it was accidentally overloaded by a factor of ~14x, with far-reaching but ultimately well-managed effects.</p>
<p><small><em>Thanks to Jesper Lundkvist for this one.</em></small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://engineering.fb.com/networking-traffic/throughput-autoscaling/" target="_blank">Throughput autoscaling: Dynamic sizing for Facebook.com</a></div>
<div class="sreweekly-description">
<p>As Facebook moved from a static to an auto-scaled web pool, they had to try to predict their expected demand as accurately as possible.</p>
<p><small>Daniel Boeve, Kiryong Ha, and Anca Agape — Facebook</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://octopus.com/blog/database-migrations-lessons-learned" target="_blank">Database migrations lessons learned</a></div>
<div class="sreweekly-description">
<p>The key lesson involves ensuring that your migrations avoid using parts of the production code, which could cause their action to change down the line inadvertently.</p>
<p><small>Frank Lin — Octopus Deploy</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.cloudflare.com/moobot-vs-gatebot-cloudflare-automatically-blocks-botnet-ddos-attack-topping-at-654-gbps/" target="_blank">Moobot vs. Gatebot: Cloudflare Automatically Blocks Botnet DDoS Attack Topping At 654 Gbps</a></div>
<div class="sreweekly-description">
<p>Cloudflare uses an interesting multi-layered approach to mitigating attacks.</p>
<p><small>Omer Yoachimik — Cloudflare</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.blameless.com/blog/availability-maintainability-reliability-whats-the-difference" target="_blank">Availability, Maintainability, Reliability: What&#8217;s the Difference?</a></div>
<div class="sreweekly-description">
<p>The availability/reliability distinction in this article is thought-provoking.</p>
<p><small>Emily Arnott — Blameless</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.adaptivecapacitylabs.com/blog/2020/09/19/troubled-times-episode-3/" target="_blank">Troubled Times: Episode 3</a></div>
<div class="sreweekly-description">
<blockquote><p>2020 has shown the value of adaptive capacity. 2021 will show whether or not adaptive capacity can be sustained.</p></blockquote>
<p>This article (not a video or podcast despite the name) also focuses on the increasing importance of learning from incidents.</p>
<p><small>Dr. Richard Cook — Adaptice Capacity Labs</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.sciencedirect.com/science/article/pii/S0003687020301903" target="_blank">Building and revising adaptive capacity sharing for technical incident response: A case of resilience engineering</a></div>
<div class="sreweekly-description">
<blockquote><p>What is resilience engineering? What does a resilience engineer do? Are there principles of resilience engineering? If so, what are they? What makes it possible to engineer resilience?</p></blockquote>
<p>This academic paper uses a case study to show how a company engineered the resilience of their system in response to a series of incidents.</p>
<p><small>Richard I. Cook and Beth Adele Long — Applied Ergonomics</small></p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://static.googleusercontent.com/media/www.google.com/en//appsstatus/ir/edgugm6kpj2ewx7.pdf">Google Drive</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">This is a post-analysis for two outages, one from this past week and the other from the week before.</li>
</ul>
</li>
<li><a href="https://www.thestar.com.my/tech/tech-news/2020/09/18/instagram-down-users-experience-brief-outages-technical-problems">Instagram</a></li>
<li><a href="https://www.thedenverchannel.com/news/national/facebook-users-report-widespread-outages">Facebook</a></li>
<li><a href="https://discord.statuspage.io/incidents/gfqnsk0l036s">Discord</a></li>
<li><a href="https://status.fastly.com/incidents/jpxtngv8hxgs">Fastly</a></li>
<li><a href="https://news.gandi.net/en/2020/09/postmortem-regarding-the-network-incident-from-september-15th-2020-on-iaas-and-paas-fr-sd3-fr-sd5-and-fr-sd6/">Gandi</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">
<blockquote><p>Postmortem regarding the Network Incident from September 15, 2020 on IAAS and PAAS FR-SD3, FR-SD5, and FR-SD6</p></blockquote>
<p>A layer 2 network loop was accidentally introduced, on two separate occasions.</p>
<p><small>Sébastien Dupas — Gandi</small></li>
</ul>
</li>
<li><a href="https://status.azure.com/en-us/status/history/">Azure</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">This was an outage on Sept. 14 in the UK South region.  A cooling system was shut off in error during a maintenance procedure.</li>
</ul>
</li>
</ul>
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