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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-245/">SRE Weekly Issue #245</a></h1>
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<i class="genericon genericon-day"></i><a class="updated" href="https://sreweekly.com/sre-weekly-issue-245/">November 22, 2020</a>
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<a href="https://sreweekly.com/sre-weekly-issue-245/" title="Permalink to SRE Weekly Issue #245" 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, StackHawk:</h2>
<p>Check out how we have built our microservices in Kubernetes here at StackHawk.<br />
<a href="https://sthwk.com/kube-services">https://sthwk.com/kube-services</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://groups.google.com/a/chromium.org/g/ct-policy/c/VJaSg717m9g" target="_blank">Trust Asia 2021 has produced inconsistent STHs</a></div>
<div class="sreweekly-description">
<p>A Certificate Transparency (CT) log failed, resulting in its permanent retirement. The incident involved unintended effects from load testing being performed in a staging environment. I have a huge amount of admiration and respect for the transparency of certification authorities (CAs) when things go wrong.</p>
<p><small>Trust Asia</small></p>
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</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.gremlin.com//blog/knowing-your-systems-and-how-they-can-fail-twilio-and-aws-talk-at-chaos-conf-2020/" target="_blank">Knowing your systems and how they can fail: Twilio and AWS talk at Chaos Conf 2020</a></div>
<div class="sreweekly-description">
<p>I like the idea that adding the ability to fail over to your system makes it much more complicated and thus more likely to fail.</p>
<p><small>Andre Newman — Gremlin</small></p>
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</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://dropbox.tech/application/building-for-reliability-at-hellosign" target="_blank">Building for reliability at HelloSign</a></div>
<div class="sreweekly-description">
<p>This one introduces some interesting concepts: the <em>error kernel</em> and <em>property testing</em>.</p>
<p><small>Kenneth Cross — HelloSign</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.algolia.com/blog/tech-startup-dilemmas-resilient-deployment-vs-exhaustive-tests/" target="_blank">Tech Startup Dilemmas: Resilient Deployment vs. Exhaustive Tests</a></div>
<div class="sreweekly-description">
<blockquote><p>[&#8230;] to be resilient, we must test everything, which consumes time that we don’t spend innovating. A good trade-off is to test in production.</p></blockquote>
<p><small>Xavier Grand — Algolia</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://victorops.com/blog/8-tips-to-create-an-accurate-and-helpful-post-mortem-incident-report" target="_blank">8 Tips to Create an Accurate and Helpful Post-Mortem Incident Report</a></div>
<div class="sreweekly-description">
<p>More useful tips as you develop your post-incident analysis process. I like their definition of &#8220;blameless&#8221;.</p>
<p><small>Zachary Flower — Splunk</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.ably.io/blog/achieving-exactly-once-message-processing-with-ably/" target="_blank">Achieving exactly-once message processing with Ably</a></div>
<div class="sreweekly-description">
<p>Exactly once delivery is hard to implement and requires explicit coordination at all levels, including the client. Ably explains how their flavor works.</p>
<p><small>Paddy Byers — Ably</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://reliability.substack.com/p/why-you-should-frequently-turn-down" target="_blank">Why you should frequently turn down ~30% of canary instances</a></div>
<div class="sreweekly-description">
<blockquote><p>The most effective (if scary) way to understand how your stateless service operates under load</p></blockquote>
<p><small>Utsav Shah — Software at Scale</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.blameless.com/blog/the-engineers-guide-to-preparing-for-black-friday-2020" target="_blank">The Engineer&#8217;s Guide to Preparing for Black Friday 2020</a></div>
<div class="sreweekly-description">
<p>Some good tips here — and a reminder that we may see even more traffic than normal due to social distancing.</p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://www.abc.net.au/news/2020-11-16/share-market-wall-st-dow-jones-asx-aud-wrap/12886904">ASX (Australian Stock Exchange)</a></li>
<li><a href="https://www.nasdaq.com/articles/coinbase-goes-down-as-bitcoin-nears-%2417k-2020-11-16">Coinbase</a></li>
<li><a href="https://domainnamewire.com/2020/11/17/godaddy-is-down/">GoDaddy</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">GoDaddy&#8217;s statement took care to explicitly state that the outage was not a security incident. This may be because they appear to have had an <a href="https://krebsonsecurity.com/2020/11/godaddy-employees-used-in-attacks-on-multiple-cryptocurrency-services/">unrelated security incident</a> around the same time, and some customer domains were taken over.</li>
</ul>
</li>
<li><a href="https://9to5google.com/2020/11/17/nest-outage-takes-out-the-app-some-devices/">Nest</a></li>
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