Latency: headers in São Paulo (GRU) · L-21

Runbook L-21 for Latency in São Paulo (GRU). Marker xserv-l-5a5587d66ca8. This page covers headers for LATAM operators, not a worldwide average.

Latency: What operators should measure

Policy for Latency is versioned as l-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.

Latency: Failure modes we actually see

Capacity notes for l-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.

Latency: How this letter ties to the rest

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

Latency cache L-08

Cache rules for Latency on l-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.

Latency headers L-09

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

Latency timeouts L-10

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

Latency regions L-11

Region names on l-11 match DNS and tickets: Bogotá / BOG, with Miami as the documented pair. Latency dashboards never say “LATAM” as if it were one RTT.