Download elapsed time in ms, including retries/backoff and integrity validation.
Selected response headers; inaccessible or missing values are null. Cache headers may be replayed from browser cache.
Requested byte offset in the object, as an exact decimal string.
Requested byte count, as an exact decimal string.
OptionaltileDecimal GraphId for tile reads, absent for archive metadata.
Actual requested object URL; avoid logging traces by default.
A validated tile/metadata fetch; 64-bit offsets and lengths remain decimal strings.