Which data source served it (the source's GeoDataSource.label).
What was loaded (request URL).
Whether it was downloaded from the source or served from the persistent cache.
'json' (tileset.json / layer.json / subtree index) or 'binary' (tile content).
Response size in bytes.
ms since navigation start (Performance.now), for ordering.
One retained load event — a network download or a persistent-cache hit.