The pool block-share snapshot is now built from the three endpoint responses and checked against the page's own validator before anything is written; a failed or partial read writes nothing. Its observation time is the source's HTTP Date header rather than the moment the receipt was assembled, and the date in its method text is generated from that observation. The 18 September file's method text named 12 September. Methodology 1.1.0; block counts and share arithmetic are unchanged.
Sources
Pool block share
Chain + Heuristic · mempool.space’s pool labels for three windows, read once a week and filed.