GitHub Availability Report: November 2025
Source: GitHub Blog
November 17 – 16:52 UTC (lasting 2 hours 16 minutes)
On November 17, 2025, from 16:52 to 19:08 UTC, Dependabot hit a rate limit in GitHub Container Registry (GHCR) and was unable to complete about 57 % of jobs within the service‑level objective (SLO).
Mitigation
We lowered the rate at which Dependabot started jobs and increased the GHCR rate limit. This resolved the incident.
Long‑term actions
- Adding new monitors and alerts to help prevent similar issues.
November 18 – 20:30 UTC (lasting 1 hour 4 minutes)
On November 18, 2025, from 20:30 to 21:34 UTC, all Git operations failed, affecting both SSH and HTTP Git client interactions as well as raw file access. Products that rely on Git operations were also impacted.
Root cause
An expired TLS certificate used for internal service‑to‑service communication.
Mitigation
The expired certificate was replaced and impacted services were restarted, resulting in full recovery.
Long‑term actions
- Updated alerting to cover expired certificates.
- Auditing other certificates to ensure proper alerting and automation before expiration.
- Accelerating the elimination of manually managed certificates, moving to fully automated service‑to‑service communication.
November 28 – 05:59 UTC (lasting 2 hours 24 minutes)
On November 28, 2025, between 05:59 and 08:24 UTC, Copilot experienced an outage affecting the Claude Sonnet 4.5 model. Users received an HTTP 400 error indicating no model was available until an alternative model was selected. Other models were not impacted.
Root cause
A misconfiguration deployed to an internal service incorrectly listed Claude Sonnet 4.5 as unavailable.
Mitigation
The configuration change was reverted, restoring normal operation.
Long‑term actions
Improving cross‑service deployment safeguards to prevent similar incidents.
For real‑time updates on status changes and post‑incident recaps, visit our status page. To learn more about what we’re working on, check out the engineering section on the GitHub Blog.