I've gone ahead and made bug 1686929 a duplicate of this one so we can track it here. I've also edited the description.
My goal is to get some prototype code for at minimum the test duplication (in autopkgtest-cloud) by the end of this weekend. I think that once that code is sorted out and is known to work, it should be merged at the same time as the Britney code, which is going to come next. The reason for this would be to make sure that people aren't confused on why tests are still visible to be retried (as mentioned in the last comment) but error out on an already queued test.
I've gone ahead and made bug 1686929 a duplicate of this one so we can track it here. I've also edited the description.
My goal is to get some prototype code for at minimum the test duplication (in autopkgtest-cloud) by the end of this weekend. I think that once that code is sorted out and is known to work, it should be merged at the same time as the Britney code, which is going to come next. The reason for this would be to make sure that people aren't confused on why tests are still visible to be retried (as mentioned in the last comment) but error out on an already queued test.