Outage in Heroku

Investigating increased dyno relocations in Cedar Common Runtime

Resolved Minor
September 09, 2025 - Started about 1 month ago - Lasted 2 days
Official incident page

Incident Report

Engineers are deploying a kernel update to Common Runtime fleets to fix an issue causing frequent dyno relocations.
Components affected
Heroku Apps

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Latest Updates ( sorted recent to last )
INVESTIGATING about 1 month ago - at 09/10/2025 08:11PM

Engineers are deploying a kernel update to Common Runtime fleets to fix an issue causing frequent dyno relocations.

INVESTIGATING about 1 month ago - at 09/09/2025 10:55PM

Engineers are investigating an issue with a networking bug in a kernel update from an upstream provider that may cause an increased occurrence of dyno relocations onto new instances. Impacted apps may see "Relocating dyno to a new server" activities in logs.

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