1.4.0: runtime health probes + settings-form debt OpcacheHealthProbeCollector and ApcuHealthProbeCollector are Shape-3 collectors that snapshot per-runtime stats once per cron and write to cwv_probes (hit rate, memory used, wasted / fragmentation, cumulative restarts, entry count). Both off by default; toggled per-runtime from opcache_probe_enabled and apcu_probe_enabled, added by cwv_update_10036. HealthTimeSeriesPanel reads the most recent 30 rows for each collector key and renders one table per runtime; runtimes with no probe rows render nothing. Settings-form debt paid off: every opt-in collector that landed since 1.0.0 now has form surface — backend cache, render tree, 1.2.0 upstream-ID headers, 1.3.0 database instrumentation, edge-cache probe targets / timeout, and the new runtime probes. Operators on 1.0.0-1.3.0 used drush cset; 1.4.0 is the canonical surface.