dnscontrol/documentation/advanced-features/concurrency-verified.md

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CONCURRENCY_VERIFIED

✅ - A checkmark means "this has been tested, and will run concurrently".
❔ - The questionmark means "it hasn't been tested, safety unknown"
❌ - The red "X" means "this has been tested, and it will not work concurrently".

Here's how to perform a test:

1. Build dnscontrol with the -race flag: go build -race (this makes a special binary)
2. Run this special binary: dnscontrol preview with a configuration that lists at least 4 domains using Porkbun. More domains is better.
3. The special binary runs much slower (1/10th the speed) because it is doing a lot of checking. If it reports problems, the error message will indicate where the problem is. It might not be 100% accurate, but it will be in the right area.