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<h1 class="entry-title" itemprop="headline" ><a href="https://sreweekly.com/sre-weekly-issue-235/">SRE Weekly Issue #235</a></h1>
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<i class="genericon genericon-day"></i><a class="updated" href="https://sreweekly.com/sre-weekly-issue-235/">September 13, 2020</a>
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<a href="https://sreweekly.com/sre-weekly-issue-235/" title="Permalink to SRE Weekly Issue #235" 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>Adding application security tests to your CI pipeline is simple. It typically takes &lt;30 minutes to setup automated testing so you can be confident of your application&#8217;s security. Check out our onboarding guide to see how to get started.<br />
<a href="https://www.stackhawk.com/blog/onboarding-guide?SREWeekly">https://www.stackhawk.com/blog/onboarding-guide?SREWeekly</a></p>
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<h2>Articles</h2>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://mads-hartmann.com/sre/2020/09/08/alerting-on-slos.html" target="_blank">Alerting on SLOs</a></div>
<div class="sreweekly-description">
<p>This isn&#8217;t just another boring article about SLOs. There&#8217;s a ton of good stuff in here about <em>why</em> they moved to SLO-based alerts, too.</p>
<blockquote><p>we’re hoping that by implementing SLOs &#8211; and alerting on them &#8211; we’ll be able to improve communication during incidents, reduce the toil on on-callers, and help improve our reliability in a way that’s meaningful to our users.</p></blockquote>
<p><small>Mads Hartmann</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://surfingcomplexity.blog/2020/08/09/a-nudge-in-the-right-direction/" target="_blank">A nudge in the right direction</a></div>
<div class="sreweekly-description">
<p>Often, serendipity gets us out of an incident or makes it less severe.</p>
<blockquote><p>Unless we treat this sort of activity as first class when looking at incidents, we won’t really understand how it can be that some incidents get resolved so quickly and some take much longer.</p></blockquote>
<p><small>Lorin Hochstein</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://netflixtechblog.com/seamlessly-swapping-the-api-backend-of-the-netflix-android-app-3d4317155187?source=rss----2615bd06b42e---4" target="_blank">Seamlessly Swapping the API backend of the Netflix Android app</a></div>
<div class="sreweekly-description">
<p>It&#8217;s your classic &#8220;replace the engines on a jet while flying it&#8221; story. My favorite part is how they recorded real traffic and played it at the old and new backend API to compare the JSON responses.</p>
<p><small>Rohan Dhruva and Ed Ballot — Netflix</small></p>
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<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://launchdarkly.com/blog/using-feature-flags-during-incident-management/" target="_blank">Using feature flags during incident management</a></div>
<div class="sreweekly-description">
<p>Feature flags can help with load shedding and throttling, and feature flag activity can even be useful data that points to contributing factors.</p>
<p><small> Dawn Parzych — LaunchDarkly</small></p>
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</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://blog.cloudflare.com/unimog-cloudflares-edge-load-balancer/" target="_blank">Unimog &#8211; Cloudflare’s edge load balancer</a></div>
<div class="sreweekly-description">
<p>Unimog uses a lot of really interesting techniques to balance layer 4 traffic, about which this article goes into in great detail.</p>
<p><small>David Wragg — Cloudflare</small></p>
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</div>
<div class="sreweekly-entry">
<div class="sreweekly-title"><a href="https://engineering.linkedin.com/blog/2020/production-testing-with-dark-canaries" target="_blank">Production testing with dark canaries</a></div>
<div class="sreweekly-description">
<p>I like this idea: it&#8217;s like a normal canary, except that you only send it a copy of traffic and discard the result, so as to avoid impacting users.</p>
<p><small>David Hoa — LinkedIn</small></p>
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<h2>Outages</h2>
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<li><a href="https://www.google.com/appsstatus#hl=en&amp;v=issue&amp;sid=4&amp;iid=8a9eec54443fadd24be8227a6dee1220">Google Drive</a></li>
<li><a href="https://www.githubstatus.com/incidents/pbz6fh7mz86w">GitHub</a></li>
<li><a href="https://finance.yahoo.com/news/facebook-reportedly-suffers-outage-parts-211847260.html">Facebook</a></li>
<li><a href="https://www.express.co.uk/life-style/science-technology/1266407/Snapchat-Down-iPhone-Android-Not-Working-Message-Failed-To-Send-Server-Status">Snapchat</a></li>
<li><a href="https://discord.statuspage.io/incidents/ww1403twnxdw">Discord</a></li>
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