feat: add tiered cache invalidation#378
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| if len(caches) == 1 { | ||
| return caches[0] | ||
| } | ||
| return Tiered{caches} |
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When exactly one backend is configured, wrapping it in Tiered changes unsupported operations into successful empty results: Tiered.Stats skips ErrStatsUnavailable and then returns a zero Stats, and ListNamespaces similarly returns an empty slice. For a lone S3 or noop cache this makes /api/v1/stats report 200 with fabricated zero capacity/object counts instead of the backend's unsupported error, which can mislead monitoring and clients; the previous single-cache passthrough avoided this.
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