Some feedback points on the proposal, and suggestions. NB Mostly I’m running NWP suites or rose-stem tests.
The differently-sized icons to mark most recent job is not intuitively meaningful for me. The suites I run might have multiple tasks running simultaneously, but from different triggers, and not even in the same cycle. The idea of a most-recent job doesn’t make much sense (i.e. I don’t care about that), because that isn’t much to do with priority (i.e. what I do care about).
“Succeeded” to me means “done, moving on” so I don’t find green to be a choice because it is an active/vibrant colour. Although I see you’ve toned down the vibrancy across the board in your planned colours.
It would be nice to have some visual cue that a running job is on it’s second (or subsequent) run. I hope this is what you mean by the dismissable warnings to make task failures prominent. Sometimes a job will be retrying 10 times, but I only ever catch it when it’s green (running) and don’t realise it’s failed. I use the table view usually, but the number of retries is way across the far right side and not in view.
Finally, it’s a pain when a task is held, it becomes impossible to access log files from previous tries.