fix(session): remove Clone derive from SessionCounter #19051
Merged
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Remove Clone from SessionCounter to prevent accidental duplication of mutable state. SessionCounter tracks live counters within SessionManager and is not cloned anywhere; keeping Clone is a footgun that could lead to diverging metrics if copies are modified independently. For cloneable counters we use Arc-based wrappers (see DisconnectionsCounter); SessionCounter should remain non-clone to reflect its ownership and mutation model.