Band-warm failures in the Rust propagation_ready pipeline were only
surfaced via Logger.warning, so Prometheus had no way to see them.
The /weather GridCache hit/miss was likewise invisible while its
/map counterpart (ScoreCache) already reported cache ratio.
- NotifyListener emits [:microwaveprop, :propagation, :notify_listener, :warm]
with %{ok, err} measurements and %{valid_time} metadata after every
propagation_ready notification. Public handle_propagation_ready/1 so
tests can exercise the warm+telemetry path without Postgrex.
- GridCache.fetch/1, fetch_bounds/2, and fetch_point/3 emit
[:microwaveprop, :weather, :grid_cache, :lookup] with a :hit | :miss
metadata key on every ETS lookup.
Graham McIntire
b7261e772c