feat/indexserver: report clone-cache usage and monorepo latency - #1163
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Measure retained clone size outside Prometheus scrapes and log cold/reused fetches and eviction reasons so the benefit and storage cost are visible. Automatically name explicitly cached repositories in the existing latency histograms instead of requiring operators to maintain a duplicate allowlist. Amp-Thread-ID: https://ampcode.com/threads/T-01a0708f-ab4b-755c-86c7-4851324cec64 Co-authored-by: Amp <amp@ampcode.com>
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Stacked on #1162. Report aggregate clone-cache bytes/count and structured fetch/eviction events so storage growth and cold-versus-warm wall time are visible. Cached monorepos automatically get their names in the existing latency histograms; the manual allowlist still works.
The Sourcegraph companion adds dashboard panels and temporarily pins this commit. Land the Zoekt stack first, then repin Sourcegraph to the landed revisions.