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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-151/">SRE Weekly Issue #151</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-151/">December 9, 2018</a>
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<a href="https://sreweekly.com/sre-weekly-issue-151/" title="Permalink to SRE Weekly Issue #151" class="email_only">View on sreweekly.com</a>
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<h2 style="text-align: center; font-size: 80%; color: #909090;">A message from our sponsor, VictorOps:</h2>
<p>SRE teams can use synthetic monitoring and real-user monitoring to create a holistic understanding of the way their system handles stress. See how SRE teams are already implementing synthetic and real-user monitoring tools:</p>
<p><a href="http://try.victorops.com/sreweekly/synthetic-and-real-user-monitoring-for-sre">http://try.victorops.com/sreweekly/synthetic-and-real-user-monitoring-for-sre</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.hostedgraphite.com/2018/12/03/a-victim-of-its-own-popularity-scaling-our-cloudwatch-integration/" target="_blank">A victim of its own popularity: Scaling our CloudWatch integration</a></div>
<div class="sreweekly-description">
<p>They used feature flags to safely transition from a single-host service to a horizontally-scaled distributed system.</p>
<p><small>Ciaran Egan and Cian Synnott — Hosted Graphite</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.awsadvent.com/2018/12/07/working-with-aws-limits/" target="_blank">Working with AWS Limits</a></div>
<div class="sreweekly-description">
<p>Limits and quotas can really ruin your day, and it can be very difficult to predict limit exhaustion before a change reaches production, as we learn in this incident story from RealSelf.</p>
<p><small>Bakha Nurzhanov — RealSelf</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://engineering.linkedin.com/blog/2018/12/defending-against-abuse-at-linkedins-scale" target="_blank">Defending Against Abuse at LinkedIn’s Scale</a></div>
<div class="sreweekly-description">
<p>The challenge: you have to defend against abuse to keep your service running, but the abuse detection also must not adversely impact the user experience.</p>
<p><small>Sahil Handa — LinkedIn</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.pagerduty.com/blog/answer-ultimate-question-on-call-life/" target="_blank">Answer to the Ultimate Question of (On-Call) Life, the Universe, and Everything: 71</a></div>
<div class="sreweekly-description">
<p>PagerDuty has developed a system for measuring on-call health, factoring in quantity of pages, time of each page, frequency, clustering of pages, etc. I love what they&#8217;re doing and I hope we see more of this in our industry.</p>
<p><small>Lisa Yang — PagerDuty</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.honeycomb.io/blog/spooky-tales-of-testing-in-production-a-recap-and-lessons-learned/" target="_blank">Spooky Tales of Testing In Production: A Recap and Lessons Learned</a></div>
<div class="sreweekly-description">
<p>A summary of three outage stories from Honeycomb&#8217;s recent event. My favorite is the third:</p>
<blockquote><p>While Google engineers had put in place procedures for ensuring bad code did not take down their servers, they hadn’t taken the same precautions with data pushes.</p></blockquote>
<p><small>Alaina Valenzuela — Honeycomb</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.wallaroolabs.com/2018/11/horizontal-scaling-reasons/" target="_blank">Reasons to Scale Horizontally</a></div>
<div class="sreweekly-description">
<p>Looking at that title, I thought to myself, &#8220;Uh, because it&#8217;s better?&#8221; It&#8217;s worth a read though, because it so eloquently explains horizontal versus vertical scaling, why you&#8217;d do one or the other, and why horizontal scaling is hard.</p>
<p><small>Sean T. Allen — Wallaroo Labs</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/netflix-techblog/cache-warming-agility-for-a-stateful-service-2d3b1da82642?source=rss----2615bd06b42e---4" target="_blank">Cache warming: Agility for a stateful service</a></div>
<div class="sreweekly-description">
<p>Netflix has some truly massive cache systems at a scale of hundreds of terabytes. Find out what they do to warm up new cache nodes before putting them in production.</p>
<p><small>Deva Jayaraman, Shashi Madappa, Sridhar Enugula, and Ioannis Papapanagiotou — Netflix</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://charity.wtf/2018/12/02/software-sprawl-the-golden-path-and-scaling-teams-with-agency/" target="_blank">Software Sprawl, The Golden Path, and Scaling Teams With Agency</a></div>
<div class="sreweekly-description">
<p>This article lays out a promising plan for reducing the number of technologies your engineering department is using while still giving engineers the freedom to choose the right tool for the job.</p>
<p><small>Charity Majors</small></p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://www.engadget.com/2018/12/03/nest-outage/">Nest</a></li>
<li><a href="https://status.github.com/messages">GitHub</a></li>
<li><a href="https://www.theregister.co.uk/2018/12/06/ericsson_o2_telefonica_uk_outage/">O2 (UK) and SoftBank (Japan)</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">I normally don&#8217;t bother mentioning mobile phone service outages, but this one has an interesting cause: an expired TLS certificate in Ericsson&#8217;s systems.</li>
</ul>
</li>
<li><a href="https://9to5google.com/2018/12/05/google-allo-down-outage/">Google Allo and Duo</a></li>
<li><a href="https://www.plymouthherald.co.uk/news/facebook-goes-down-again-users-2295108">Facebook</a></li>
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