v0.8.5

Enhancements

1. Optional DataStorage metrics collection. The per-DataStorage prompp_data_storage_* metrics (removed by default in v0.8.3 to fix a page leak) can now be collected again on an opt-in basis: DataStorage takes an explicit flag so metrics are gathered only where needed, keeping the default hot path allocation-free (#418).

Performance

1. Faster scrape parsing. Reworked the scraper WAL hashdex encoding/marking, reducing parse and read-parse time (also benefiting from the newer compiler) (#329).
2. Release transaction snapshot on commit. TransactionHead now resets its LSS snapshot as soon as the transaction is committed instead of holding it, lowering peak memory during ingestion (#422).

Fixes

1. CPU flavor detection selected baseline bindings on all CPUs. determine_arch_flavor() called __builtin_cpu_supports() without first initializing __cpu_model, so the entrypoint could run before libgcc's CPU-detection constructor and every feature check returned 0 — the generic/k8 baseline bindings were always chosen even on modern CPUs (visible as amd64_k8_* symbols in profiles). It now calls __builtin_cpu_init() before feature detection, so the real CPU flavor is selected (#423).
2. Use-after-free with detached C++ metrics pages. Reworked metrics-page iteration around a generation-based wrapper cache with an atomic active/detach handshake, so a page physically freed by remove_unused_pages() can no longer be reclaimed while another scrape is still iterating it. Replaces the earlier mitigation with a robust fix (#413).
3. Dependency security updates. Bumped Go modules golang.org/x/text to v0.39.0 (#430), golang.org/x/net to v0.56.0 (#429) and google.golang.org/grpc to v1.82.1 (#431), and web UI packages body-parser to v1.20.6 (#420), webpack-dev-server to v5.2.6 (#421) and immutable to v4.3.9 (GHSA-v56q-mh7h-f735, GHSA-xvcm-6775-5m9r), picking up upstream security fixes.