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The Go runtime provides a number of configuration knobs that subtly change its behavior, and we cannot control which of these is available over time as we change which version of Go we're building with. It's therefore possible that an OpenTofu user might be intentionally or unintentionally relying on one of these settings for OpenTofu to work on their system, in which case they would be broken if they upgraded to a newer version of OpenTofu which uses a different Go version that no longer supports that setting. These log lines are intended to help us more quickly notice that possibility if someone opens a bug report describing an unexpected behavior change after upgrading to a new OpenTofu minor release series. We can ask the reporter to share "TF_LOG=debug" output from both the previous and new releases to compare, and then these log lines should appear in the older version's output so we can search the Go codebase and issue tracker for each of the mentioned names to learn if the handling of that setting has changed between Go versions. Signed-off-by: Martin Atkins <mart@degeneration.co.uk>