Does Uptime on letter U share fate with other letters?

The control plane is shared. Data-plane queues for Uptime stay isolated, so incident u-01 cannot drain neighbor letters.

Where is Uptime measured first?

From Santiago (SCL) toward Bogotá. A global average is not an SLO for letter U.

Uptime: handoff in São Paulo (GRU) · U-17

Runbook U-17 for Uptime in São Paulo (GRU). Marker xserv-u-0288168c8bc5. This page covers handoff for LATAM operators, not a worldwide average.

Uptime: How this letter ties to the rest

Handoff from letter U Uptime into the rest of the platform uses the same request IDs as the gateway. Runbook u-05 names who accepts the ticket after São Paulo pages out. Santiago does not silently inherit the incident.

Uptime: A note on cost and transit

Rollback for u-06 is a documented command, not a hope. Transit is billed as backup while Uptime prefers peering in Santiago. If cost spikes, the runbook cuts overflow to Bogotá before touching customer prefixes.

Uptime: Why it matters on this continent

Design for Uptime on letter U starts in São Paulo (GRU). Runbook u-01 keeps a single owner, a written rollback, and a traffic split that can be reversed without a global freeze. Neighbors in Santiago only take overflow after the local pool fails a health window.

Uptime policy U-03

Policy for Uptime is versioned as u-03. Operators measure error rate, p95 from Bogotá, and time-to-rollback — not a worldwide average. Changes land in Bogotá first, then Miami, with a hold if either region regresses.

Uptime capacity U-04

Capacity notes for u-04 assume rainy-season power in Miami and festival peaks toward São Paulo. The failure we actually see is a single uplink, not a cartoon partition of the whole continent. Spare ports and a second provider sit on the same runbook.