Need: Document how to improve and troubleshoot query performance in the Troubleshooting section.

When it's observed a query performance, it's needed to understand where the bottleneck exists and with this, what parameters can be changed to improve the query. Some metrics are available as visible in the upstream article "The concise guide to Loki: How to get the most out of your query performance" [0], but it should be required to indicate the best steps and metrics from Red Hat to understand if any parameter can be changed in the Loki side or if the issue is in the network or in the storage (permanent or temporary)

[0] https://grafana.com/blog/2023/12/28/the-concise-guide-to-loki-how-to-get-the-most-out-of-your-query-performance/