Anis Elleuch bacf6156c1
metrics: Avoid crash when fetching tier metrics (#14493)
Data usage does not always contain tiering info even if the data usage
information is valid. Avoid a crash in that case.

(e.g. the scanner scanned the namespace, the user enables tiering,
prometheus scrapes the server before the scanner gets a chance to
update the data usage with new tiering information)
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