Grab performance bar data for arbitrary requests
This is kind of the inverse of https://gitlab.com/gitlab-org/gitlab-ce/issues/60877, maybe?
The performance bar can technically fetch data for any request in the last 30 minutes (https://github.com/peek/peek#configuring-the-default-adapter):
Peek doesn't persist the request data forever. It uses a safe 30 minute cache length that way data will be available if you'd like to aggregate it or use it for other Peek views.
We could use that, with the correlation IDs we already have (which are used to fetch performance bar data), to get the performance bar data for slow user requests, as long as we find out in 30 minutes.
I'm not sure if this is especially useful or not but it is interesting, I guess?