tcp_close_total doesn't have classification or errno label

[taind772]

According to the document

Connection Close Labels
The following labels are added only to metrics which are updated when a connection closes (tcp_close_total and tcp_connection_duration_ms):
classification: success if the connection terminated cleanly, failure if the connection closed due to a connection failure.

I couldn't find any label that matched the description

My linkerd/linkerd-viz version: 2.11.1