RenderLog.sizeBytes records how large the produced PDF was, in bytes, copied from the render result. It lets operators track output size trends per source or tenant — useful for spotting documents that balloon unexpectedly or for capacity planning. Like durationMs, it is recorded as 0 when the render fails (success: false), so a non-zero sizeBytes indicates a render that actually emitted a document.
Skarn PDF
RenderLog.sizeBytes
The byte size of the rendered PDF — zero on failure.