Will like to understand, how to see if bucket are rolling as ber age based retention?
You could use
| rest "/services/admin/cacheman/bid|_internal~106~33B81190-7EE1-4FCD-AC6D-DC4E3BEF7E1C|" | table cm:bucket.directory *time | convert ctime(cm:bucket.earliest_time) as e_time | convert ctime(cm:bucket.latest_time) as l_time
or
| dbinspect index=main cached=true| search state=warm OR state=cold| stats max(endEpoch) AS endEpoch BY bucketId| sort -endEpoch| search endEpoch<1548641953| fields bucketId