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-77

Runbook U-77 for Uptime in São Paulo (GRU). Marker xserv-u-ceb616113c9c. 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 rollback U-06

Uptime peering U-07

Peering for Uptime (u-07) prefers the IX fabric that already carries last-mile ISPs in Bogotá. Session counts and prefix limits are on the same page as the Miami backup path.

Uptime cache U-08

Cache rules for Uptime on u-08 keep language-correct objects near Miami. São Paulo is a sibling cache, not an origin. TTLs are short enough that a bad asset does not live through a weekend.

Uptime headers U-09

Headers for u-09 carry the letter, the region (GRU) and a request id. Uptime debugging in São Paulo should not require a packet capture in Santiago first.