There are a couple of places that do very similar things when searching for metadata. As an example, consider this sample from test_disagg_checkpoint_size04:

def get_database_size(self):
    match = re.search(r'database_size=(\d+)', self.disagg_get_complete_checkpoint_meta())
    assert(match)
    return int(match.group(1))

Here, we search checkpoint metadata for the database size. We have a bunch of other similar functions – for example, layered64 looks for checksums, and layered75 looks for file IDs. We should refactor these to have one single utility for doing it.