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Docs: Add API endpoints used for templating in Prometheus (#39639)

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docs/sources/datasources/prometheus.md
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@ -117,13 +117,13 @@ types of template variables.
Variable of the type _Query_ allows you to query Prometheus for a list of metrics, labels or label values. The Prometheus data source plugin
provides the following functions you can use in the `Query` input field.
| Name | Description |
| ----------------------------- | ----------------------------------------------------------------------- |
| `label_names()` | Returns a list of label names. |
| `label_values(label)` | Returns a list of label values for the `label` in every metric. |
| `label_values(metric, label)` | Returns a list of label values for the `label` in the specified metric. |
| `metrics(metric)` | Returns a list of metrics matching the specified `metric` regex. |
| `query_result(query)` | Returns a list of Prometheus query result for the `query`. |
| Name | Description | Used API endpoints |
| ----------------------------- | ----------------------------------------------------------------------- | --------------------------------- |
| `label_names()` | Returns a list of label names. | /api/v1/labels |
| `label_values(label)` | Returns a list of label values for the `label` in every metric. | /api/v1/label/`label`/values |
| `label_values(metric, label)` | Returns a list of label values for the `label` in the specified metric. | /api/v1/series |
| `metrics(metric)` | Returns a list of metrics matching the specified `metric` regex. | /api/v1/label/\_\_name\_\_/values |
| `query_result(query)` | Returns a list of Prometheus query result for the `query`. | /api/v1/query |
For details of what _metric names_, _label names_ and _label values_ are please refer to the [Prometheus documentation](http://prometheus.io/docs/concepts/data_model/#metric-names-and-labels).