The logs half was gated on the swarm's log store being enabled, so turning
that store off stopped collection entirely rather than leaving the upstream
export. Logs now fan out exactly as metrics do: the store when it runs, the
operator's upstream when one is configured, both when both.
The receiver, the journal mount and the group grant follow whether there is
anywhere to send logs, not whether the local store exists. Tying the mount to
the store instead would render a receiver that can read nothing.
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