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* master: name the unlabeled disk layout plainly in assign errors When no volume server serves the layout an assign targets, the error named the empty disk type as "hdd" (HardDriveType is the empty string), sending operators looking for servers labeled hdd when the actual mismatch is labeled (e.g. -disk=ssd) servers versus unlabeled clients. - describe the layout as "default (unlabeled)" when the disk type is empty, keep %q naming for labeled types - log the unserved-layout condition once per option instead of letting every failing write repeat an unactionable line Observed in production: volume servers started with -disk=ssd while CSI mounts assign with the unlabeled layout; the per-write error stream pointed at a nonexistent hdd fleet. * master: bound and expire the unserved-layout warning dedupe The dedupe map retained every distinct option key permanently. Option keys embed request-derived fields (collection, disk type), so repeated assignments with distinct options would grow master memory without bound, and a retained key suppressed the warning if the same option went unserved again after the topology recovered. Remember last-warned timestamps instead, expiring after an hour, with a hard cap that resets the set when a client-driven key flood fills it. * master: silence per-retry unserved-layout log and name explicit hdd Addresses Devin Review comments on #11290. - The unserved-layout branch already rate-limits its warning via assignUnservedLayoutWarning.Do, but the common epilogue still logged lastErr at V(0) on every retry, so the flood the dedup was meant to stop continued. Skip the epilogue log when the unserved-layout branch owns the logging; the error is still returned to the client. - describeDiskLayout took the canonicalized option.DiskType, but ToDiskType folds both "" and "hdd" into HardDriveType, so an explicit disk=hdd request was mislabeled "default (unlabeled)". Pass the original request disk type instead: only an empty request is the unlabeled default; an explicit hdd is named "hdd". Adds TestAssignFailsFastNamesExplicitHdd covering the explicit-hdd wording. --------- Co-authored-by: Chris Lu <chris.lu@gmail.com>