CHW-5608 CacheDiscoverFailed

failed to enumerate cached artifacts on the storage backend; retry shortly

Default message: failed to enumerate cached artifacts on the storage backend; retry shortly
HTTP status: 500 (server)

Problem. Cache purge failed while enumerating artifacts on the storage backend. Cause. An IO failure inside FindPathsByCoordinate (disk error, S3 listing failure, …). Fix. Retry shortly; persistent failures warrant inspecting the storage backend health endpoint. HTTP 500.