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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-399/">SRE Weekly Issue #399</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-399/">November 19, 2023</a>
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<a href="https://sreweekly.com/sre-weekly-issue-399/" title="Permalink to SRE Weekly Issue #399" class="email_only">View on sreweekly.com</a>
<div class="sreweekly-sponsor-message" style="border: 1px solid #b0b0b0;margin-top: 2rem;margin-bottom: 2rem;margin-left: auto;margin-right: auto;padding-left: 1rem;padding-right: 1rem;width: 80%;align: center;">
<h2 style="text-align: center;font-size: 80%;color: #909090;">A message from our sponsor, <a href="https://firehydrant.com/">FireHydrant</a>:</h2>
<p>Severity levels help responders and stakeholders understand the incident impact and set expectations for the level of response. This can mean jumping into action faster. But first, you have to ensure severity is actually being set. Here&#8217;s one way.<br>
<a href="https://firehydrant.com/blog/incident-severity-why-you-need-it-and-how-to-ensure-its-set/">https://firehydrant.com/blog/incident-severity-why-you-need-it-and-how-to-ensure-its-set/ </a></p>
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<div class="sreweekly-title"><a href="https://ferd.ca/notes/paper-how-in-the-world-did-we-ever-get-into-that-mode.html" target="_blank" rel="noopener">Paper: How in the World Did We Ever Get into That Mode?</a></div>
<div class="sreweekly-description">
<p>This research paper summary goes into Mode Error and the dangers of adding more features to a system in the form of modes, especially if the system can change modes on its own.</p>
<p>&nbsp;&nbsp;<small>Fred Hebert (summary)</small><br>
&nbsp;&nbsp;<small>Dr. Nadine B. Sarter (original paper)</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="http://blog.cloudflare.com/post-mortem-on-cloudflare-control-plane-and-analytics-outage/" target="_blank" rel="noopener">Post Mortem on Cloudflare Control Plane and Analytics Outage</a></div>
<div class="sreweekly-description">
<p>Cloudflare suffered a power outage in one of the datacenters housing their control and data planes. The outage itself is intriguing, and in its aftermath, Cloudflare learned that their system wasn&#8217;t as HA as they thought.</p>
<p>Lots of great lessons here, and if you want more, they posted <a href="http://blog.cloudflare.com/cloudflare-incident-on-october-30-2023/">another incident writeup</a> recently.</p>
<p>&nbsp;&nbsp;<small> Matthew Prince — Cloudflare</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://lab.scub.net/command-query-responsibility-segregation-cqrs-93e35d1929ec" target="_blank" rel="noopener">Architecture Patterns : Command Query Responsibility Segregation (CQRS)</a></div>
<div class="sreweekly-description">
<p>Separating write from read workloads can increase complexity but also open the door to greater scalability, as this article explains.</p>
<p>&nbsp;&nbsp;<small>Pier-Jean Malandrino</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.codereliant.io/load-shedding/" target="_blank" rel="noopener">Load Shedding for High Traffic Systems</a></div>
<div class="sreweekly-description">
<p>Covers four strategies for load shedding, with code examples:</p>
<ul>
<li>Random Shedding</li>
<li>Priority-Based Shedding</li>
<li>Resource-Based Shedding</li>
<li>Node Isolation</li>
</ul>
<p>  <small>Code Reliant</small></p>
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</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.pragmaticengineer.com/aws-azure-and-gcp-regional-outages/" target="_blank" rel="noopener">Handling a Regional Outage: Comparing the Response From AWS, Azure and GCP</a></div>
<div class="sreweekly-description">
<p>Lots of juicy details about the three outages, including a link to AWS&#8217;s write-up of their Lambda outage in June.</p>
<p>&nbsp;&nbsp;<small>Gergely Orosz</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://lab.scub.net/architecture-patterns-the-circuit-breaker-8f79280771f1" target="_blank" rel="noopener">Architecture Patterns : The Circuit-Breaker</a></div>
<div class="sreweekly-description">
<p>The diagrams in this article are especially useful for understanding how the circuit-breaker pattern works.</p>
<p>&nbsp;&nbsp;<small>Pier-Jean Malandrino</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://hart-michael.medium.com/how-to-be-on-call-034e3a202729" target="_blank" rel="noopener">How to be on-call</a></div>
<div class="sreweekly-description">
<p>This one&#8217;s about how on-call can go bad, and how to structure your team&#8217;s on-call so to be livable and sustainable.</p>
<p>&nbsp;&nbsp;<small>Michael Hart</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://rootly.com/blog/working-effectively-with-executives-during-an-incident" target="_blank" rel="noopener">Working Effectively With Executives During an Incident</a></div>
<div class="sreweekly-description">
<p>Execs cast a big shadow in an incident, so it&#8217;s important to have a plan for how to communicate with them, as this article explains.</p>
<p>&nbsp;&nbsp;<small>Ashley Sawatsky — Rootly</small></p>
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