Is transit the default path?

No. Peering in Miami is default; transit to São Paulo is overflow and is billed that way.

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.

Uptime: docs in Miami (MIA) · U-12

Runbook U-12 for Uptime in Miami (MIA). Marker xserv-u-e65a0b32915c. This page covers docs for LATAM operators, not a worldwide average.

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: How XServ runs it day to day

Probes for Uptime (u-02) leave Santiago every 15s toward Bogotá. XServ pages the named owner if loss or RTT crosses the letter budget. A probe never shares a queue with bulk transfers, so a saturated WAN does not hide a dead PoP.

Uptime handoff U-05

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 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.