Does TLS on letter T share fate with other letters?

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

Where is TLS measured first?

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

TLS: headers in São Paulo (GRU) · T-45

Runbook T-45 for TLS in São Paulo (GRU). Marker xserv-t-10a2e331d2b5. This page covers headers for LATAM operators, not a worldwide average.

TLS: What operators should measure

Policy for TLS is versioned as t-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.

TLS: Failure modes we actually see

Capacity notes for t-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.

TLS: How this letter ties to the rest

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

TLS capacity T-04

TLS handoff T-05

TLS rollback T-06

Rollback for t-06 is a documented command, not a hope. Transit is billed as backup while TLS prefers peering in Santiago. If cost spikes, the runbook cuts overflow to Bogotá before touching customer prefixes.

TLS peering T-07

Peering for TLS (t-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.