Postmortem Index

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GitHub

19 published postmortems tracked here, spanning Sep 2012 – Feb 2026.

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Postmortems
19
Categories
7
Years covered
15
Products
6
Title Date Categories Source
GitHub Actions and Codespaces outage of February 2026
GitHub Actions, GitHub Codespaces, GitHub Copilot, CodeQL, Dependabot, GitHub Enterprise Importer, GitHub Pages
 2026-02-02 – 2026-02-03
Automation Cascading Failure Config Change Security
Original →
GitHub DNS infrastructure failure and service degradation on October 11, 2024
DNS
 2024-10-11 – 2024-10-12
Automation Cascading Failure Config Change Security
Original →
GitHub.com database configuration change causes 36-minute outage
GitHub.com
 2024-08-14
Automation Config Change Security
Original →
GitHub Copilot degradation on July 13, 2024
github copilot
 2024-07-13
Automation Config Change Security
Original →
GitHub availability incidents May 9-11, 2023
Git databases, GitHub App authentication
 2023-05-09
Automation Config Change Security
Original →
GitHub mysql1 cluster repeated service disruptions (March 2022)
mysql1 cluster
 2022-03-16 – 2022-03-23
Automation Config Change Security
Original →
GitHub November 2021 Availability Incident due to MySQL Schema Migration
GitHub Actions, API Requests, Codespaces, Git Operations, Issues, GitHub Packages, GitHub Pages, Pull Requests, Webhooks
 2021-11-27
Automation Cascading Failure Cloud Config Change Security
Original →
GitHub Actions and Pages impacted by scoped token INT32 overflow
GitHub Actions, GitHub Pages, GitHub API, Git commands
 2021-05-16
Automation Config Change Security
Original →
GitHub background job system degraded availability October 2020
background job system
 2020-10-09 – 2020-10-10
Automation Config Change Security
Original →
GitHub February 2020 mysql1 service disruptions
mysql1 database cluster
 2020-02-19 – 2020-02-27
Automation Config Change Security
Original →
GitHub October 2018 Service Degradation due to MySQL Failover
GitHub services
 2018-10-21 – 2018-10-22
Automation Cloud Config Change Hardware Security
Original →
GitHub January 28th, 2016 datacenter power disruption
GitHub
 2016-01-28
Automation Cascading Failure Cloud Config Change Hardware Security
Original →
GitHub DDoS attack of March 2014
GitHub
 2014-03-11
Automation Config Change Security Time
Original →
GitHub DNS Outage on January 8, 2014
DNS infrastructure
 2014-01-08
Automation Cascading Failure Config Change Security
Original →
GitHub.com outage of December 2012
GitHub.com
 2012-12-22 – 2012-12-23
Automation Config Change Security
Original →
GitHub network problems on November 30, 2012
network
 2012-11-30 – 2012-12-01
Automation Config Change Security
Original →
GitHub.com availability issues in September 2012
GitHub.com
 2012-09-10
Automation Config Change Security
Original →
Untitled postmortem
Original →
GitHub availability incidents in February and March 2026
GitHub platform, GitHub Actions, authentication, user management, Redis
Automation Cascading Failure Cloud Config Change Security
Original →