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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-173/">SRE Weekly Issue #173</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-173/">June 16, 2019</a>
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<a href="https://sreweekly.com/sre-weekly-issue-173/" title="Permalink to SRE Weekly Issue #173" class="email_only">View on sreweekly.com</a>
<p>I&#8217;m back! Thank you all so much for the outpouring of support while SRE Weekly was on hiatus.  My recovery is going nicely and I&#8217;m starting to catch up on my long backlog of articles to review.  I&#8217;m going to skip trying to list all the outages that occurred since the last issue and instead just focus on a couple of interesting follow-up posts.</p>
<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, VictorOps:</h2>
<p>Alert fatigue will kill team morale. Take a look at some great ways to avoid alert fatigue and why it’s important for employee health and incident resolution speed:</p>
<p><a href="http://try.victorops.com/SREWeekly/Avoiding-Alert-Fatigue">http://try.victorops.com/SREWeekly/Avoiding-Alert-Fatigue</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.adaptivecapacitylabs.com/blog/2019/05/20/the-negotiability-of-severity-levels/" target="_blank">The Negotiability of &#8220;Severity&#8221; Levels</a></div>
<div class="sreweekly-description">
<p>So many awesome concepts packed into this article. Here are just a couple:</p>
<blockquote><p>Seen in this light, “severity” could be seen as a <strong>currency</strong> that product owners and/or hiring managers could use to ‘pay’ for attention.</p></blockquote>
<blockquote><p>This yields the logic that if a customer was affected, learning about the incident is worth the effort, and if no customers experienced negative consequences for the incident, then there must not be much to learn from it.</p></blockquote>
<p><small>John Allspaw — Adaptive Capacity Labs</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://simonfredsted.com/1721" target="_blank">How Webhook.site handles 100 mbit/s traffic on a single VPS</a></div>
<div class="sreweekly-description">
<p>This shares more in common with the server behind <code>sreweekly.com</code> than I perhaps ought to admit to:</p>
<blockquote><p>Additionally, lots can be done for scalability regarding infrastructure: I&#8217;ve kept everything on a single, smaller server basically as a matter of stubbornness and wanting to see how far I can push a single VPS.</p></blockquote>
<p><small>Simon Fredsted</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.postgresql.org/message-id/CALSof1GM6i21BLr8PsFiRYazakojvesdc+_MiR-L_V5NNkRuWg@mail.gmail.com" target="_blank">PostgreSQL: pg_upgrade can result in early wraparound on databases with high<br />
transaction load</a></div>
<div class="sreweekly-description">
<p>A Reddit engineer explains a hidden gotcha of <code>pg_upgrade</code> that caused an outage I reported here previously.</p>
<p><small>Jason Harvey — Reddit</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.aviationpros.com/airlines/news/21084636/pilots-at-mias-biggest-cargo-airline-warned-execs-a-crash-was-coming-then-a-plane-went-down" target="_blank">Pilots at MIA&#8217;s Biggest Cargo Airline Warned Execs a Crash Was Coming. Then a Plane Went Down.</a></div>
<div class="sreweekly-description">
<p>This has &#8220;normalization of deviance&#8221; all over it.</p>
<p><small>Taylor Dolven — The Miami Herald</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.nytimes.com/2019/06/01/business/boeing-737-max-crash.html" target="_blank">Boeing Built Deadly Assumptions Into 737 Max, Blind to a Late Design Change</a></div>
<div class="sreweekly-description">
<p>The deep details around MCAS are starting to come out. This article tells a tale that is all too familiar to me about organizational pressures and compartmentalization.</p>
<p><small>Jack Nicas, David Gelles and James Glanz &#8212; New York Times</small></p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://cloud.google.com/blog/topics/inside-google-cloud/an-update-on-sundays-service-disruption">Google</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Click through for Google&#8217;s blog post about the outage that impacted Google Cloud Platform, YouTube, Gmail, Google Drive.A configuration change intended for a small number of servers was incorrectly applied more broadly, causing reduced network capacity. The similarity to the second Heroku outage below is striking.</li>
</ul>
</li>
<li><a href="https://status.heroku.com/incidents/1776">Heroku Incident #1776 Follow-up</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">An expired SSL certificate caused control plane impact and some impact to running applications.</li>
</ul>
</li>
<li><a href="https://status.heroku.com/incidents/1789">Heroku Incident #1789 Follow-up</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">A configuration change intended for a testing environment was mistakenly applied to production, resulting in 100% of requests in the EU failing.</li>
</ul>
</li>
</ul>
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