Appendix A: Glossary
| Term | Definition |
|---|---|
| Spot Instance | AWS EC2 instance using spare capacity at discounted prices |
| Preemptible VM | GCP VM that can be terminated by Google at any time |
| Spot VM | Azure VM using spare capacity at discounted prices |
| Durable Object | Cloudflare’s stateful serverless compute primitive |
| Kivera | Cloud security proxy that enforces policies on cloud API requests |
| Arbitrage | Taking advantage of price differences across markets/providers |
| Workload | A customer’s running application or job on spot infrastructure |
| Placement | The decision of which provider, region, and instance type to use |
| Interruption | When a cloud provider reclaims a spot/preemptible instance |
| Health Check | Periodic verification that a workload instance is responsive |
| Routing | Directing user traffic to the correct workload instance |
| D1 | Cloudflare’s serverless SQL database |
| KV | Cloudflare’s globally distributed key-value store |
| Workers | Cloudflare’s serverless JavaScript/TypeScript execution environment |
| Spectrum | Cloudflare’s TCP/UDP proxy service |
| Workflows | Cloudflare’s durable execution engine for long-running tasks |