Loki 2.x to 3.0 upgrade
Upgrading Loki from 2.x to 3.0: moving to TSDB and schema v13, structured metadata, removed shipper settings, new default limits that can reject logs, and planning ahead for the removal of simple scalable mode in 4.0.

Major Loki version upgrades and the schema, storage and configuration changes the official upgrade guide requires.
Upgrading Loki from 2.x to 3.0: moving to TSDB and schema v13, structured metadata, removed shipper settings, new default limits that can reject logs, and planning ahead for the removal of simple scalable mode in 4.0.

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