docs: Add guidance to migrate to TSDB before upgrading

grafana / loki

Like Prometheus, but for logs.

https://grafana.com/loki

GNU Affero General Public License v3.0

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Closed JStickler closed 2 weeks ago

JStickler commented 2 weeks ago

What this PR does / why we need it:

Since so much of Loki 3.x assumes that users are already on TSDB, adding guidance to migrate to TSDB before upgrading to Loki 3.x.