cache: migrate to Otter v2 with write-based expiry - #7357
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Keep positive capacity and TTL validation, overwrite expiration, and deletion metric labels. Cover overwrite expiry with virtual time. Otter v2 changes eviction from S3-FIFO to W-TinyLFU; cache entries remain best-effort. Amp-Thread-ID: https://ampcode.com/threads/T-01a08089-bc34-7278-9e04-d691e62b07f9 Co-authored-by: Amp <amp@ampcode.com>
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Flo4604
added this pull request to stack #7369
September 9, 2026 08:42
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Problem:
Otter v2 changes the cache API and expiry policy. A direct version bump could change overwrite TTL behavior.
Solution:
Migrate to Otter 2.3.0 with write-based expiry and an overwrite-expiry regression test.
Impact:
Preserves positive capacity/TTL checks and deletion metric labels. Eviction changes from S3-FIFO to W-TinyLFU.
Draft stack prerequisites: #7330 and #7320 through #7326.
deps/integration-baseis a merge-only review anchor, not implementation work to merge separately. Do not merge this stack into that anchor. After both prerequisites land, rebase the dependency stack onto currentmainand retarget bottom PR #7353 tomain; keep later PRs based on the preceding layer. Existing prerequisite PRs are unchanged.Testing:
Cache package passed 55 tests under the race detector in combined verification.
Final combined compatible stack (not an independent run of every intermediate PR):
mise run test --concurrency=4: 303 suites, 24,506 passed, zero failed, 7,875 ignored; 186 cached.GOFLAGS=-race mise run test --concurrency=4: 303 suites, 24,506 passed, zero failed, 7,875 ignored; 279 cached.mise run build: passed; lint reported zero issues.Full normal and race runs used separate test-container scopes. The race run resumed after fixing the cancellation fixture. An earlier analytics-count timeout did not recur; its cause remains unconfirmed. These are local verification results, not a claim that draft CI ran or passed.