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My cache made things faster once. I have no way to know if it still does.
What you'll have at the end
A hit rate panel beside the endpoint's latency panel, plus an alert on the ratio itself, both proved against a real deploy to catch a cache regression before the old latency-only alert would.
You need
An endpoint already showing latency on a dashboard with its own sustained-breach alert, sitting in front of a cache-aside layer that reads and writes real keys for real traffic.
Not covered
Instrumenting the cache's own memory, eviction, or connection-pool health, or proving the cache's overall speed benefit with a load test: this only adds the one missing number, hit rate, onto the row that already tracks latency.
Leans on
Your dashboard is missing the four golden signals
Build the endpoint's own traffic, error, and latency row first if it doesn't exist yet; this recipe only adds the cache's own number beside it.
Prove your cache is faster, never slower
That recipe proves a cache is worth keeping once, with a load test; this one watches whether it keeps paying off, every day, on a live dashboard.
Checked 19 Aug 2026
Part of the Backend Observability and Monitoring cookbook