- add docs for Grafana Cloud mimir configuration to avoid auth pitfall I ran into

[ingshtrom]

context: I originally set up Grizzly with Grafana Cloud Mimir with the following config, which do not pass grr config check.

grr config set mimir.address https://prometheus-xyz.grafana.net/api/prom
grr config set mimir.tenant-id 123456
grr config set mimir.api-key abcdef12345

A simple change fixed this, but I didn't realize until a Grafana PS engineer pointed it out to me. Hopefully I can help someone else with this in the future. Here is what I should have done

grr config set mimir.address https://prometheus-xyz.grafana.net/
grr config set mimir.tenant-id 123456
grr config set mimir.api-key abcdef12345

Signed-off-by: Alex Hokanson [email protected]

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