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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-239/">SRE Weekly Issue #239</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-239/">October 11, 2020</a>
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<a href="https://sreweekly.com/sre-weekly-issue-239/" title="Permalink to SRE Weekly Issue #239" 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>CI/CD has changed software engineering. Application security, however, has been left behind. Why doesn&#8217;t your CI pipeline have AppSec checks?<br />
<a href="https://www.stackhawk.com/blog/ci-pipeline-security-bug-testing?utm_source=SREWeekly">https://www.stackhawk.com/blog/ci-pipeline-security-bug-testing?utm_source=SREWeekly</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://ayende.com/blog/189537-C/respect-your-natural-scaling-limits" target="_blank"> Respect your natural scaling limits</a></div>
<div class="sreweekly-description">
<p>Don&#8217;t scale up farther than you need to! If you won&#8217;t ever see more than 100 RPS, don&#8217;t architect for 100,000.</p>
<p><small>Ayende Rahien</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://medium.com/slalom-build/the-many-shapes-of-site-reliability-engineering-468359866517" target="_blank">The Many Shapes of Site Reliability Engineering</a></div>
<div class="sreweekly-description">
<p>This one covers several common patterns of SRE practice and then offers insight on what to look for as you design your own SRE team.</p>
<p><small>Rob Cummings — Slalom Build</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://surfingcomplexity.blog/2020/08/09/abstractions-and-implicit-preconditions/" target="_blank">Abstractions and implicit preconditions</a></div>
<div class="sreweekly-description">
<blockquote><p>Abstractions make us more productive, and, indeed, we humans can’t build complex systems without them. But we need to be able to peel away the abstraction layers when things go wrong, so we can discover the implicit precondition that’s been violated.</p></blockquote>
<p><small>Lorin Hochstein</small></p>
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</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://cacm.acm.org/magazines/2020/9/246941-keeping-calm/fulltext" target="_blank">Keeping CALM: When Distributed Consistency Is Easy</a></div>
<div class="sreweekly-description">
<p>Coordination between nodes in a distributed system can kill performance. What kinds of problems require coordination? The CALM theorem can tell us.</p>
<p><small>Joseph M. Hellerstein and Peter Alvaro — Communications of the ACM</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.blameless.com/blog/incident-retrospective-postmortem-template" target="_blank">The Ultimate, Free Incident Retrospective Template</a></div>
<div class="sreweekly-description">
<p>Here&#8217;s another good post-incident analysis document template that you can use as inspiration for your own.</p>
<p><small>Hannah Culver — Blameless</small></p>
</div>
</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://www.blameless.com/blog/4-signs-software-reliability-has-become-a-top-priority-for-your-company" target="_blank">4 Signs Software Reliability Should be Your Top Priority</a></div>
<div class="sreweekly-description">
<p>As your product ages, it transitions from &#8220;cool new thing&#8221; to &#8220;tool everyone uses and expects to Just Work&#8221;. Your reliability needs will change accordingly.</p>
<p><small>Lyon Wong — Blameless</small></p>
</div>
</div>
<h2>Outages</h2>
<ul class="sreweekly-outages">
<li><a href="https://status.pagerduty.com/incidents/1f2tfsyt09sw">PagerDuty</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">95% of event submissions (your systems telling PagerDuty to trigger an alert) failed for about an hour. They posted some detail about what went wrong.</li>
</ul>
</li>
<li><a href="https://status.slack.com//2020-10/e8c094cc99aabf64">Slack</a>
<ul class="sreweekly-outage">
<li class="sreweekly-outage">Their latest update on this outage contains some detail about what went wrong.</li>
</ul>
</li>
<li><a href="https://mspoweruser.com/telegram-apologises-for-yesterdays-downtime-reveals-cause/">Telegram</a></li>
<li><a href="https://www.crn.com/news/cloud/-very-frustrating-microsoft-office-365-outage-hits-u-s-again">Microsoft Office 365</a></li>
<li><a href="https://www.9news.com.au/national/coles-supermarkets-australia-reports-it-issues-causing-cash-registers-to-stop/942891ec-6d7b-4176-bd95-d5bdbb4b0049">Coles Supermarkets</a></li>
<li><a href="https://bestgamingpro.com/its-not-just-you-adobe-creative-cloud-is-down-right-now/">Adobe Creative Cloud</a></li>
<li><a href="https://www.githubstatus.com/incidents/28js6274ybpb">GitHub</a></li>
</ul>
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