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ws-head-latency: read REGION env var (align with other harnesses)#1200

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Merged
Flotapponnier merged 1 commit into from
Jul 16, 2026
Merged

ws-head-latency: read REGION env var (align with other harnesses) #1200

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11 changes: 6 additions & 5 deletions harnesses/ws-head-latency/cmd/script/metrics.go
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Expand Up@@ -16,15 +16,16 @@ import (
// VPS + Railway hybrid) never collides series across vantage points
// and no observation site needs to know about the region.
//
// Region resolution order at startup: OCB_REGION, then
// RAILWAY_REPLICA_REGION (Railway sets it automatically), then the
// eu-west default that matches the historical single-vantage Paris
// VPS deployment. Set OCB_REGION explicitly on each replica to
// Region resolution order at startup: REGION (matches the convention
// used by rpc-capabilities and every other multi-region harness on
// Railway), then RAILWAY_REPLICA_REGION (Railway auto-sets it), then
// the eu-west default that matches the historical single-vantage
// Paris VPS deployment. Set REGION explicitly on each replica to
// guarantee a stable value across redeploys.
var region = resolveRegion()

func resolveRegion() string {
if r := os.Getenv("OCB_REGION"); r != "" {
if r := os.Getenv("REGION"); r != "" {
return r
}
if r := os.Getenv("RAILWAY_REPLICA_REGION"); r != "" {
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