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 [Flowdock](https://web.archive.org/web/20220704223244/https://flowdock-resources.s3.amazonaws.com/legal/Flowdock-RCA-For-Incident-On-2020-04-21.pdf). Flowdock instant messaging was unavailable for approx 24 hrs between April 21-22 2020. The COVID-19 pandemic caused a sudden and drastic increase in working from home, which caused a higher usage of Flowdock, which caused high CPU usage, which caused the application database to hang. Some user data was permanently lost.
 
-[Foursquare](https://news.ycombinator.com/item?id=1769761). MongoDB fell over under load when it ran out of memory. The failure was catastrophic and not graceful due to a a query pattern that involved a read-load with low levels of locality (each user check-in caused a read of all check-ins for the user's history, and records were 300 bytes with no spatial locality, meaning that most of the data pulled in from each page was unnecessary). A lack of monitoring on the MongoDB instances caused the high load to go undetected until the load became catastrophic, causing 17 hours of downtime spanning two incidents in two days.
+[Foursquare](https://web.archive.org/web/20230602082218/https://news.ycombinator.com/item?id=1769761). MongoDB fell over under load when it ran out of memory. The failure was catastrophic and not graceful due to a a query pattern that involved a read-load with low levels of locality (each user check-in caused a read of all check-ins for the user's history, and records were 300 bytes with no spatial locality, meaning that most of the data pulled in from each page was unnecessary). A lack of monitoring on the MongoDB instances caused the high load to go undetected until the load became catastrophic, causing 17 hours of downtime spanning two incidents in two days.
 
 [Gentoo](https://wiki.gentoo.org/wiki/Github/2018-06-28). An entity gained access to the Gentoo GitHub organization, removed access to all developers and started adding commits in various repositories.
 
 [GitHub](https://githubengineering.com/ddos-incident-report/). On February 28th 2018, GitHub experienced a DDoS attack, hitting the website with 1.35Tbps of traffic.
 
-[Gitlab](https://docs.google.com/document/d/1ScqXAdb6BjhsDzCo3qdPYbt1uULzgZqPO8zHeHHarS0/preview?sle=true&hl=en&forcehl=1#heading=h.dfbilqgnc5sf). After the primary locked up and was restarted, it was brought back up with the wrong filesystem, causing a global outage. See also [HN discussion](https://news.ycombinator.com/item?id=8003601).
+[Gitlab](https://docs.google.com/document/d/1ScqXAdb6BjhsDzCo3qdPYbt1uULzgZqPO8zHeHHarS0/preview?sle=true&hl=en&forcehl=1#heading=h.dfbilqgnc5sf). After the primary locked up and was restarted, it was brought back up with the wrong filesystem, causing a global outage. See also [HN discussion](https://web.archive.org/web/20220127094354/https://news.ycombinator.com/item?id=8003601).
 
 [Gitlab](https://about.gitlab.com/2017/02/10/postmortem-of-database-outage-of-january-31/). Influx of requests overloaded the database, caused replication to lag, tired admin deleted the wrong directory, six hours of data lost. See also [earlier report](https://about.gitlab.com/2017/02/01/gitlab-dot-com-database-incident) and [HN discussion](https://news.ycombinator.com/item?id=13537052).