Observability: design in São Paulo (GRU) · O-13

Runbook O-13 for Observability in São Paulo (GRU). Marker xserv-o-dadef62db6ca. This page covers design for LATAM operators, not a worldwide average.

Observability: Why it matters on this continent

Design for Observability on letter O starts in São Paulo (GRU). Runbook o-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.

Observability: How XServ runs it day to day

Probes for Observability (o-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.

Observability: What operators should measure

Policy for Observability is versioned as o-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.

Observability peering O-07

Peering for Observability (o-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.

Observability cache O-08

Cache rules for Observability on o-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.

Observability headers O-09

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

Observability timeouts O-10

Timeouts on o-10 are tighter than the WAN RTT to Bogotá. Observability in Santiago fails fast and retries once; a third try needs a human because it is no longer a blip.