docs: Add guidance to migrate to TSDB before upgrading (backport release-3.1.x)

grafana / loki

Like Prometheus, but for logs.

https://grafana.com/loki

GNU Affero General Public License v3.0

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Closed loki-gh-app[bot] closed 2 weeks ago

loki-gh-app[bot] commented 2 weeks ago

Backport afe70a9f7ed2cc5aa4cfe998fd38d8dfa299e926 from #14675

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.