Does SLA on letter S share fate with other letters?

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

Where is SLA measured first?

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

SLA: headers in São Paulo (GRU) · S-69

Runbook S-69 for SLA in São Paulo (GRU). Marker xserv-s-d35d8b31b6ea. This page covers headers for LATAM operators, not a worldwide average.

SLA: What operators should measure

Policy for SLA is versioned as s-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.

SLA: Failure modes we actually see

Capacity notes for s-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.

SLA: How this letter ties to the rest

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

SLA peering S-07

Peering for SLA (s-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.

SLA cache S-08

Cache rules for SLA on s-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.

SLA headers S-09

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

SLA timeouts S-10

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