Incident with Pages - Deployment Lag

Lesson: Teams should account for deployment lag by monitoring static site hosting service health.

What happened

On August 6, 2026, at 07:00 UTC, a configuration change inadvertently reduced the capacity of the service that processes GitHub Pages deployments. As traffic increased over the following hours, latency in the deployment pipeline progressively increased. At 12:09 UTC, latency crossed the alerting threshold and the team began investigating. We reverted the invalid configuration and applied additional mitigations, including reducing status deployment processing to lower the load on our Redis cluster. Latency returned to normal levels at 15:40 UTC. Customer impact occurred from 11:34 to 15:32 UTC. During this period, we failed to process approximately 128,000 deployments. We have updated our alerts to detect elevated processing latency sooner and to notify us immediately when latency causes deployment processing failures. We've confirmed this incident was not fully captured by our availability metrics. In the coming days, we'll update how GitHub Pages availability is measured so incidents like this are accurately reflected going forward.

1. Resolved · Aug 6, 16:22 UTC
   On August 6, 2026, at 07:00 UTC, a configuration change inadvertently reduced the capacity of the service that processes GitHub Pages deployments. As traffic increased over the following hours, latency in the deployment pipeline progressively increased. At 12:09 UTC, latency crossed the alerting threshold and the team began investigating. We reverted the invalid configuration and applied additional mitigations, including reducing status deployment processing to lower the load on our Redis cluster. Latency returned to normal levels at 15:40 UTC. Customer impact occurred from 11:34 to 15:32 UTC. During this period, we failed to process approximately 128,000 deployments. We have updated our alerts to detect elevated processing latency sooner and to notify us immediately when latency causes deployment processing failures. We've confirmed this incident was not fully captured by our availability metrics. In the coming days, we'll update how GitHub Pages availability is measured so incidents like this are accurately reflected going forward.
2. Monitoring · Aug 6, 15:50 UTC
   The degradation affecting Pages has been mitigated. We are monitoring to ensure stability.
3. Investigating · Aug 6, 15:03 UTC
   We are investigating reports of degraded performance for Pages