Session recording snapshots now carry $snapshot_host

1.402.0

Minor Changes

• #4143 0e8ad14 Thanks @robbie-c! - Stamp the current hostname as $snapshot_host on every $snapshot event the session recorder sends. The value is derived from the page URL after it passes through the existing replay URL masking pipeline (maskCapturedNetworkRequestFn / deprecated maskNetworkRequestFn, hash stripping, personal-data query-param masking), so it cannot bypass a customer's masking config. When masking removes the URL or the masked result doesn't parse as a URL, the property is omitted entirely. This gives ingestion consumers a per-message host signal even for mid-session snapshot batches that contain no URL-bearing events. (2026-07-15)