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 [Indian Electricity Grid](https://web.archive.org/web/20220124104632/https://cercind.gov.in/2012/orders/Final_Report_Grid_Disturbance.pdf). One night in July 2012, a skewed electricity supply-demand profile developed when the northern grid drew a tremendous amount of power from the western and eastern grids. Following a series of circuit breakers tripping by virtue of under-frequency protection, the entire NEW (northern-eastern-western) grid collapsed due to the absence of islanding mechanisms. While the grid was reactivated after over 8 hours, similar conditions in the following day caused the grid to fail again. However, the restoration effort concluded almost 24 hours after the occurrence of the latter incident.
 
-[Instapaper](https://web.archive.org/web/20211124170124/https://medium.com/making-instapaper/instapaper-outage-cause-recovery-3c32a7e9cc5f). Also [this](https://blog.instapaper.com/post/157027537441). Limits were hit for a hosted database. It took many hours to migrate over to a new database.
+[Instapaper](https://web.archive.org/web/20211124170124/https://medium.com/making-instapaper/instapaper-outage-cause-recovery-3c32a7e9cc5f). Also [this](https://web.archive.org/web/20240911020547/https://blog.instapaper.com/post/157027537441). Limits were hit for a hosted database. It took many hours to migrate over to a new database.
 
-[Intel](https://42gems.com/blog/?p=735). A scripting bug caused the generation of the divider logic in the Pentium to very occasionally produce incorrect results. The bug wasn't caught in testing because of an incorrect assumption in a proof of correctness. (See [the Wikipedia article on 1994 FDIV bug](https://en.wikipedia.org/wiki/Pentium_FDIV_bug) for more information.)
+[Intel](https://web.archive.org/web/20241105190743/http://42gems.com/blog/?p=735). A scripting bug caused the generation of the divider logic in the Pentium to very occasionally produce incorrect results. The bug wasn't caught in testing because of an incorrect assumption in a proof of correctness. (See [the Wikipedia article on 1994 FDIV bug](https://en.wikipedia.org/wiki/Pentium_FDIV_bug) for more information.)
 
-[Joyent](https://www.joyent.com/blog/manta-postmortem-7-27-2015). Operations on Manta were blocked because a lock couldn't be obtained on their PostgreSQL metadata servers. This was due to a combination of PostgreSQL's transaction wraparound maintenance taking a lock on something, and a Joyent query that unnecessarily tried to take a global lock.
+[Joyent](https://web.archive.org/web/20220528044329/https://www.joyent.com/blog/manta-postmortem-7-27-2015). Operations on Manta were blocked because a lock couldn't be obtained on their PostgreSQL metadata servers. This was due to a combination of PostgreSQL's transaction wraparound maintenance taking a lock on something, and a Joyent query that unnecessarily tried to take a global lock.
 
 [Joyent](https://www.joyent.com/blog/postmortem-for-outage-of-us-east-1-may-27-2014). An operator used a tool with lax input validation to reboot a small number of servers undergoing maintenance but forgot to type `-n` and instead rebooted all servers in the datacenter. This caused an outage that lasted 2.5 hours, rebooted all customer instances, put tremendous load on DHCP/TFTP PXE boot systems, and left API systems requiring manual intervention. See also [Bryan Cantrill's talk](https://www.youtube.com/watch?v=30jNsCVLpAE).