~p50 / ~p95 are load-weighted means of the daily percentiles; error chips: green <1%, amber 1–5%, red ≥5%.
Backend calls (client-observed)
4xx / 5xx are server-generated failures; net / t-o are network drops and timeouts seen from the client.
Top error codes
Codes come from the services' {"error": …} response envelope (registry: context/analytics/registry/error-codes.yaml); — means the failure carried no code (network drop, or a service off the envelope). Top 50 by occurrences.