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Prometheus: Add documentation for ad-hoc filters (#31122)

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* Prometheus: Add documentation for ad-hoc filters

* Update docs/sources/datasources/prometheus.md

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

* Update docs/sources/datasources/prometheus.md

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

* Add link to ad hoc filters doumentation

* Change direct url for relative

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
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@ -141,6 +141,11 @@ There are two syntaxes:
Why two ways? The first syntax is easier to read and write but does not allow you to use a variable in the middle of a word. When the _Multi-value_ or _Include all value_
options are enabled, Grafana converts the labels from plain text to a regex compatible string. Which means you have to use `=~` instead of `=`.
### Ad hoc filters variable
Prometheus supports the special [ad hoc filters]({{< relref "../variables/variable-types/add-ad-hoc-filters.md" >}}) variable type. It allows you to specify any number of label/value filters on the fly. These filters are automatically
applied to all your Prometheus queries.
## Annotations
[Annotations]({{< relref "../dashboards/annotations.md" >}}) allow you to overlay rich event information on top of graphs. You add annotation