constantly get alert even when buckets were deleted: Metadata overhead warning. Over 52% of RAM allocated to bucket "default" on node "NODE" is taken up by keys and metadata

steps: default & sasl bucket with heavy dgm, vb_active_resident_items_ratio ~ 30%

removed the buckets

and get to receive messages even when buckets do not exist anymore

[18:15:15] - Metadata overhead warning. Over 52% of RAM allocated to bucket "default" on node "10.3.121.115" is taken up by keys and metadata.
[18:15:15] - Metadata overhead warning. Over 63% of RAM allocated to bucket "sasl" on node "10.3.121.115" is taken up by keys and metadata.
[18:15:15] - Metadata overhead warning. Over 50% of RAM allocated to bucket "default" on node "10.3.121.114" is taken up by keys and metadata.
[18:15:15] - Metadata overhead warning. Over 62% of RAM allocated to bucket "sasl" on node "10.3.121.114" is taken up by keys and metadata.
[18:15:15] - Metadata overhead warning. Over 52% of RAM allocated to bucket "default" on node "10.3.121.113" is taken up by keys and metadata.
[18:15:15] - Metadata overhead warning. Over 62% of RAM allocated to bucket "sasl" on node "10.3.121.113" is taken up by keys and metadata.
[18:15:15] - Metadata overhead warning. Over 61% of RAM allocated to bucket "sasl" on node "10.3.121.112" is taken up by keys and metadata.
[18:15:15] - Metadata overhead warning. Over 50% of RAM allocated to bucket "default" on node "10.3.121.112" is taken up by keys and metadata.