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when you run `pulumi up` it would show a preview of the actions it would do before you confirm the changes to be applied on AWS.

it looks like a change in your application code might have caused the resources to get deleted. but as mentioned before, this would show up, unless you are running something like `pulumi up -y` or `pulumi up -f -y` to automatically approve with skipping preview.

if you are using <https://app.pulumi.com/signin?reason=401|Pulumi Cloud>, you could check the stack activity history, that might show at which point the resources were deleted.