What is this feature?
Allows the creation of alert rules with mimirtool in a specified folder.
Why do we need this feature?
Currently, the APIs for mimirtool create namespaces and rule groups in the root folder without the ability to set a custom folder. For example, it could be a special "Imported" folder, etc.
This PR makes it possible with a special header: mimirtool ... --extra-headers="X-Grafana-Alerting-Folder-UID=123". If it's not present, the root folder is used, otherwise, the specified one is used.
mimirtool does not support nested folder structures, while Grafana allows folder nesting. To keep compatibility, we return only direct child folders of the working folder (as namespaces) with rule groups and rules that are directly in these child folders as if there are no nested folders.
For example, given this folder structure in Grafana:
```
grafana/
├── production/
│ ├── service1/
│ │ └── alerts/
│ └── service2/
└── testing/
└── service3/
```
If the working folder is "grafana":
Only namespaces "production" and "testing" are returned
Only rule groups directly within these folders are included
If the working folder is "production":
- Only namespaces "service1" and "service2" are returned
Only rule groups directly within these folders are included
What is this feature?
Adds an API endpoint to create alert rules with mimirtool:
- POST /convert/prometheus/config/v1/rules/{NamespaceTitle} - Accepts a single rule group in a Prometheus YAML format and creates or updates a Grafana rule group from it.
The endpoint uses the conversion package from #100224.
Key parts
The API works similarly to the provisioning API. If the rule does not exist, it will be created, otherwise updated. Any rules not present in the new group will be deleted, ensuring the group is fully synchronized with the provided configuration.
Since the API works with namespace titles (folders), the handler automatically creates a folder in the root based on the provided title if it does not exist. It also requires a special header, X-Grafana-Alerting-Datasource-UID. This header specifies which datasource to use for the new rules.
If the rule group's evaluation interval is not specified, it uses the DefaultRuleEvaluationInterval from settings.
Alexander Akhmetov
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