Should the crater-bot result comment contain the amount of crates on the retry-regressed-list.txt?

[Skgland]

Since the addition of the prepare-fail category a lot more spurious results that could hide actual regressions can be retired, but the result comment does not inform about spurious results which I think might lead to users of crater bot to think a result is good even though hundreds thousand crates have an indeterminate result and might deserve a retry. Adding the amount of crates on the retry-regressed-list.txt (maybe with an explanation of how to use it) would probably help to more often run a retry when a lot of spurious failures are encountered.

Current Comment Example rust-lang/rust#145608 (comment):

🎉 Experiment pr-145608 is completed!
📊 6 regressed and 8 fixed (685389 total)
📰 Open the summary report.

⚠️ If you notice any spurious failure please add them to the denylist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

Suggestion

🎉 Experiment pr-145608 is completed!
📊 6 regressed and 8 fixed (685389 total)
📊 155079 Spurious results, consider a retry with crater <mode> crates=https://crater-reports.s3.amazonaws.com/pr-145608/retry-regressed-list.txt if these are many.
📰 Open the summary report.

⚠️ If you notice any spurious failure please add them to the denylist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

#763 would make the retry command easier.

[Skgland]

rust-lang/rust#122661 (comment) is an example we're a retry wasn't conducted, but would likely have found a regression if it had been.