{"version":"2.1.260","anchor":"prompt-cache-miss-telemetry-now-records-a-cause","canonical_anchor":"prompt-cache-miss-telemetry-now-records-a-cause","heading":"Prompt-cache miss telemetry now records a cause","tier":"internal","area":"Elsewhere","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.260\/e\/prompt-cache-miss-telemetry-now-records-a-cause","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.260","markdown":"### Prompt-cache miss telemetry now records a cause\n\nPrompt-cache miss telemetry now records the specific reason for the miss.\n\nPrompt-cache telemetry now records why a cache miss happened. The tracking data gains `last_miss_cause` (with `tools_added`, `tools_removed`, and `system_char_delta` detail) and `miss_causes`, backed by a lookup table mapping internal cause codes such as `system_prompt_changed`, `betas_changed`, and `ttl_expired_5m` to human-readable strings.\n\n- Area: Elsewhere\n- Tier: Under the hood\n- Useful: 2\/5\n- Signal: 1\/5"}