43 postmortems from Heroku

• Issue with uneven routing distribution Jul 18, 2025 Incident Heroku outageroutingload-balancing
• Summary of Heroku June 10 Outage Jun 10, 2025 Incident Heroku outageinfrastructurenetworking +3
• Routing failures on Common Runtime, EU region Oct 8, 2024 Incident Heroku outageddosrouting +1
• Issues with Heroku API, Dashboard, and CLI Jun 8, 2023 Incident Heroku outagedatabasepostgres +3
• Platform API Outage Mar 16, 2023 Incident Heroku outageapinetworking +1
• Degraded availability Aug 15, 2022 Incident Heroku outageroutingautoscaling +3
• Issues with Dyno Restarts, Builds, Releases and Heroku CI Apr 22, 2022 Incident Heroku outageloggingdyno +1
• April 2022 Incident Review Apr 13, 2022 Incident Heroku outagesecuritybreach +4
• Missing Metrics, Heroku Connect Dashboard Unavailable Sep 30, 2021 Incident Heroku outagessllogging +1
• Database availability issues Sep 27, 2021 Incident Heroku outagedatabasepostgres +2
• Issue accessing common runtime applications in EU Region Sep 17, 2021 Incident Heroku outageroutingnetworking
• Issues with release phase, Heroku CI, app setups, and Review apps Sep 1, 2021 Incident Heroku outagedeploymentci +1
• Dynos not starting Jul 20, 2021 Incident Heroku outagedynodeployment
• Authentication Errors Apr 27, 2021 Incident Heroku outageauthenticationmfa +1
• API issues Mar 25, 2021 Incident Heroku outageapidns +1
• API Issues Feb 10, 2021 Incident Heroku outageapinetworking
• How I Broke git push heroku main Sep 3, 2020 Incident Heroku outagegitdeployment +2
• API Issues Apr 22, 2020 Incident Heroku outageapiredis +1
• EU Dyno Errors Mar 3, 2020 Incident Heroku outagedynodeployment
• Delay in Dyno Booting and Release Phase Tasks Oct 31, 2019 Incident Heroku outagedynodeployment +2
• Widespread Platform Issues Aug 31, 2019 Incident Heroku outagedynodatabase +1
• Platform-wide Outages May 31, 2018 Incident Heroku outagedatabasepostgres +1
• Missing application logs in drains Jan 10, 2018 Incident Heroku outageloggingaws +1
• Postgres, Kafka, Redis Availability Nov 2, 2017 Incident Heroku outagedatabasepostgres +3
• Dyno Management and Build Availability Oct 31, 2017 Incident Heroku outagedynodeployment +1
• Increased rate of "H10 App Crashed" errors Apr 5, 2017 Incident Heroku outageroutingconfig-error +1
• Platform Outages Feb 28, 2017 Incident Heroku outageawss3 +3
• How We Found and Fixed a Filesystem Corruption Bug Feb 15, 2017 Incident Heroku outagefilesystemdynos +3
• Dyno filesystem permission problems Feb 2, 2017 Incident Heroku outagedynofilesystem +3
• EU Region Network Latency Dec 15, 2016 Incident Heroku outagednsaws +1
• Issues with DNS resolution Oct 21, 2016 Incident Heroku outagednsddos +1
• Increased routing latency in the EU region Aug 11, 2016 Incident Heroku outageroutingnetworking +1
• Latency Incident Report: Socket Bind Before Connect Aug 11, 2016 Incident Heroku outageroutingnetworking +3
• Elevated Build and API Error Rates Sep 20, 2015 Incident Heroku outageawsdynamodb +2
• Elevated Error rates Feb 3, 2015 Incident Heroku outagedynomonitoring +1
• Dynos Unable to Start Jun 23, 2014 Incident Heroku outagedynosredis +2
• API and Build Issues Jun 3, 2014 Incident Heroku outageapidatabase +2
• API issues Sep 4, 2013 Incident Heroku outageapidatabase +2
• ssl:endpoint unavailability Dec 24, 2012 Incident Heroku outagesslaws +1
• Widespread Application Outage Jun 29, 2012 Incident Heroku outageawsec2 +3