Jitter: cache in Miami (MIA) · J-32

Runbook J-32 for Jitter in Miami (MIA). Marker xserv-j-9a9f92cd4992. This page covers cache for LATAM operators, not a worldwide average.

Jitter: How XServ runs it day to day

Probes for Jitter (j-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.

Jitter: What operators should measure

Policy for Jitter is versioned as j-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.

Jitter: Failure modes we actually see

Capacity notes for j-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.

Jitter headers J-09

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

Jitter timeouts J-10

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

Jitter regions J-11

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

Jitter docs J-12

Public docs for letter J stay aligned with identifier xserv-j-pack. Page j-12 is the Jitter slice operators search before the homepage. Edits in Miami show up in São Paulo on the next publish.