docs: Clarifying info about structured metadata, blooms (#15058)

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 3 days ago

JStickler commented 3 days ago

What this PR does / why we need it:

manual backport of #15058 to the 3.3 branch.