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Docs: Added information about Prometheus write permission requirement. (#44616)

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* Added note.

* Fixed typo.
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docs/sources/alerting/unified-alerting/alerting-rules/create-cortex-loki-managed-rule.md
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@ -11,11 +11,13 @@ Grafana allows you to create alerting rules for an external Cortex or Loki insta
## Before you begin
For Cortex and Loki data sources to work with Grafana 8.0 alerting, enable the ruler API by configuring their respective services.
- Verify that you have write permission to the Prometheus data source. Otherwise, you will not be able to create or update Cortex managed alerting rules.
**Loki** - The `local` rule storage type, default for the Loki data source, supports only viewing of rules. To edit rules, configure one of the other rule storage types.
- For Cortex and Loki data sources, enable the ruler API by configuring their respective services.
**Cortex** - When configuring a Grafana Prometheus data source to point to Cortex, use the [legacy `/api/prom` prefix](https://cortexmetrics.io/docs/api/#path-prefixes), not `/prometheus`. The Prometheus data source supports both Cortex and Prometheus, and Grafana expects that both the [Query API](https://cortexmetrics.io/docs/api/#querier--query-frontend) and [Ruler API](https://cortexmetrics.io/docs/api/#ruler) are under the same URL. You cannot provide a separate URL for the Ruler API.
- **Loki** - The `local` rule storage type, default for the Loki data source, supports only viewing of rules. To edit rules, configure one of the other rule storage types.
- **Cortex** - use the [legacy `/api/prom` prefix](https://cortexmetrics.io/docs/api/#path-prefixes), not `/prometheus`. The Prometheus data source supports both Cortex and Prometheus, and Grafana expects that both the [Query API](https://cortexmetrics.io/docs/api/#querier--query-frontend) and [Ruler API](https://cortexmetrics.io/docs/api/#ruler) are under the same URL. You cannot provide a separate URL for the Ruler API.
> **Note:** If you do not want to manage alerting rules for a particular Loki or Prometheus data source, go to its settings and clear the **Manage alerts via Alerting UI** checkbox.