There are so many agile metrics available to track the progress. There are few which are fairly common, like Velocity, Burn Down Chart, etc.
In my personal view, I believe these metrics are good but they lack the level of details team will require to trigger.
In my view, there are 3 metrics by which team should be able to measure their progress. And again, I am not saying these are the only ones, there could be more depending on what you want to measure.