Check manual page of ibm_storage_ts.status
IBM Tape Library: Device Status
This check displays the global device status as reported by
The status will be OK if the device status is documented as
"Ok", WARN if it's "non-critical", "other" or "unknown" and
CRIT for "critical" and "non-Recoverable" status.
Please note that this status is likely derived from the status
of managed libraries so this check status and the status in
ibm_storage_ts.library are probably not independent.
Exactly one item is discovered.