why we show removed snaps in ceph osd dump pool info?

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what is the purpose for we to show the removed snaps? look like the removed snaps no use to the user. we use rbd export and import backup images from one ceph cluster to another ceph cluster. the increment image backup depand on the snap.and we wiil remove the snap after the backup.so it will show a lot of snaps removed like below!

'volumes' replicated size 2 min_size 1 crush_rule 1 object_hash rjenkins pg_num 128 pgp_num 128 last_change 5554 flags hashpspool stripe_width 0 application rbd
        removed_snaps [1~4,6~5f,66~149,1b0~660,811~1,813~1,815~1,817~1,819~1,81b~1,81d~1,81f~1,821~1,823~1,825~1,827~1,829~1,82b~1,82d~1,82f~1,831~1,833~1,835~1,837~1,839~1,83b~1,83d~1,83f~1,841~1,843~1,845~1,847~1,849~1,84b~1,84d~1,84f~1,851~1,853~1,855~1,857~1,859~1,85b~1,85d~1,85f~1,861~1,863~1,865~1,867~1,869~1,86b~1,86d~1,86f~1,871~1,873~1,875~1,877~1,879~1,87b~1,87d~1,87f~1,881~1,883~1,885~1,887~1,889~1,88b~1,88d~1,88f~1,891~1,893~1,895~1,897~1,899~1,89b~1,89d~1,89f~1,8a1~1,8a3~1,8a5~1,8a7~1,8a9~1,8ab~1,8ad~1,8af~1,8b1~1,8b3~1,8b5~1,8b7~1,8b9~1,8bb~1,8bd~1,8bf~1,8c1~1,8c3~1,8c5~1,8c7~1,8c9~1,8cb~1,8cd~1,8cf~1,8d1~1,8d3~1,8d5~1,8d7~1,8d9~1,8db~1,8dd~1,8df~1,8e1~1,8e3~1,8e5~1,8e7~1,8e9~1,8eb~1,8ed~1,8ef~1,8f1~1,8f3~1,8f5~1,8f7~1,8f9~1,8fb~1,8fd~1,8ff~1,901~1,903~1,905~1,907~1,909~1,90b~1,90d~1,90f~1,911~1,913~1,915~1,917~1,919~1,91b~1,91d~1,91f~1,921~1]


 

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