How does Grafana's LRU query cache handle cache key fragmentation from high-cardinality Prometheus labels?
Cache Key Composition and Fragmentation Grafana's query cache stores responses keyed by query text, time range, and template variables. With a default 10-second TTL and 10 MB per-data-source limit, high-cardinality labels like request_id or session_id generate numerous unique cache entries, causing fragmentation. Eviction Policy Limitations The LRU eviction