This is definitely something that we have considered. We're particularly interested in being able to generate per-PR comparison metrics (which we already have the data for, just not necessarily indexed):
"This PR increased test runtime by a statistically significant amount"
Without care over time test suites get slower, I would like to be able to view the test suite performance as a whole and per test target performance.
I would also like to write alerts and notify relevant team members about the relative performance of their tests