Capacity
How the backend queues and runs live test calls: a global concurrency cap, a durable queue, and worker autoscaling. Changes apply to new calls immediately.
Live usage
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Cap & queue
Global in-flight cap across all workers.
Requests beyond this are rejected with 429.
A call queued longer than this is expired (failed).
Worker autoscaling
off
0 = scale-to-zero when idle (cold start on first call).
Hard ceiling on workers — your cost cap.
How many calls one worker handles at once.
Wait this long at low demand before scaling down.
Max replicas is your hard spend ceiling; min 0 lets workers scale to zero when idle. In dry-runthe controller computes and shows what it would do but doesn't touch Railway — the live railway scale call is wired at deploy.