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<!-- This is an auto-generated comment: release notes by coderabbit.ai --> - Core invariant: config refresh events must reliably propagate updated values and evict cached entries within a bounded time window; tests must observe this deterministically without relying on fixed sleeps. - Logic simplified: brittle fixed time.Sleep delays and separate error assertions were replaced by assert.Eventually polling blocks that combine value checks and cache-eviction verification, and consolidated checks to reduce redundant assertions. - Why no data loss / no behavior regression: only test synchronization and assertions were changed—production config manager code paths (value propagation, KV puts, cache eviction) are untouched; tests now wait for the same outcomes more robustly, so no mutation of runtime behavior or storage occurs. - Enhancement scope: this is a test-stability improvement (no new runtime capability); it fixes flaky unit tests (root cause: timing assumptions) by replacing fixed waits with bounded polling and by using t.Context for KV puts to align test context usage. <!-- end of auto-generated comment: release notes by coderabbit.ai --> Signed-off-by: aoiasd <zhicheng.yue@zilliz.com>