Obtainability, Part 2: The API That Tells You What You Can Get
There's a beta Compute Engine endpoint that answers "can I get twenty Spot VMs of a given machine type in this region right now?" with a number between zero and one, and most teams on Spot have never called it. A working tour of the capacity-advice APIs (advice.capacity and advice.capacityHistory): the exact request, the exact response, and the roles/compute.viewer plus ADC setup that gets you there. Read the per-zone shards, not just the headline obtainability score. The shards tell you where your capacity actually is. Then how to read the number well: these scores are advisory by design, they move between calls, and a score you read as a reservation will steer you wrong at the worst possible moment. Part 2 of the Obtainability series.