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Docs: Document which data sources work with caching (#36561)

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* Document which data sources work with caching

* add Prometheus and Loki to exclusions

* update list of built-in data sources

I checked in Grafana v8.0.4 and these were the built-in data sources that do work with query caching.

* Apply suggestions from code review

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* alphabetize list

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
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docs/sources/enterprise/query-caching.md
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@ -27,6 +27,23 @@ You can make a panel retrieve fresh data more frequently by increasing the **Max
- Reduced API costs.
- Reduced likelihood that APIs will rate-limit or throttle requests.
## Data sources that work with query caching
Query caching works for all [Enterprise data sources](https://grafana.com/grafana/plugins/?type=datasource&enterprise=1), and it works for the following [built-in data sources]({{< relref "../datasources/_index.md" >}}):
- CloudWatch
- Google Cloud Monitoring
- InfluxDB
- Microsoft SQL Server
- MySQL
- Postgres
- Tempo
Some data sources, such as Elasticsearch, Prometheus, and Loki, cache queries themselves, so Grafana query caching does not improve performance.
Query caching also works for all data sources that include a backend. More specifically, caching works with data sources that extend the `DataSourceWithBackend` class in the plugins SDK.
To tell if a data source works with query caching, follow the instructions below to **Enable and Configure query caching**. If caching is enabled in Grafana but the Caching tab is not visible for the given data source, then query caching is not available for that data source.
## Enable and configure query caching
You must be an Org admin or Grafana admin to enable query caching for a data source. For more information on Grafana roles and permissions, visit the [Permissions page]({{< relref "../permissions/_index.md" >}}).