docs: Add tags available for every metric in PaC

added tags/keys in documentation availabe for every metric
in Pipelines as Code. this helps users to filter out metric
based on specific tag.

Signed-off-by: Zaki Shaikh <zashaikh@redhat.com>

Author: zakisk

docs/content/docs/install/metrics.md

@@ -1,6 +1,7 @@
 ---
 title: Metrics
 weight: 16
+BookToC: false
 ---
 
 # Metrics Overview
@@ -10,12 +11,12 @@ The metrics for pipelines-as-code can be accessed through the `pipelines-as-code
 pipelines-as-code supports various exporters, such as Prometheus, Google Stackdriver, and more.
 You can configure these exporters by referring to the [observability configuration](../config/config-observability.yaml).
 
-| Name                                                 | Type    | Description                                                        |
-|------------------------------------------------------|---------|--------------------------------------------------------------------|
-| `pipelines_as_code_git_provider_api_request_count`   | Counter | Number of API requests submitted to git providers                  |
-| `pipelines_as_code_pipelinerun_count`                | Counter | Number of pipelineruns created by pipelines-as-code                |
-| `pipelines_as_code_pipelinerun_duration_seconds_sum` | Counter | Number of seconds all pipelineruns have taken in pipelines-as-code |
-| `pipelines_as_code_running_pipelineruns_count`       | Gauge   | Number of running pipelineruns in pipelines-as-code                |
+| Name                                                 | Type    | Labels/Tags                                                                                                                                                                     | Description                                                        |
+|-------------------------------------------------------|----------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------|
+| `pipelines_as_code_git_provider_api_request_count`   | Counter | `provider`=&lt;git_provider&gt; <br> `event-type`=&lt;event_type&gt; <br> `namespace`=&lt;pipelinerun_namespace&gt; <br> `repository`=&lt;repository_cr_name&gt;                | Number of API requests submitted to git providers                  |
+| `pipelines_as_code_pipelinerun_count`                | Counter | `provider`=&lt;git_provider&gt; <br> `event-type`=&lt;event_type&gt; <br> `namespace`=&lt;pipelinerun_namespace&gt; <br> `repository`=&lt;repository_cr_name&gt;                | Number of pipelineruns created by pipelines-as-code                |
+| `pipelines_as_code_pipelinerun_duration_seconds_sum` | Counter | `namespace`=&lt;pipelinerun_namespace&gt; <br> `repository`=&lt;repository_cr_name&gt; <br> `status`=&lt;pipelinerun_status&gt; <br> `reason`=&lt;pipelinerun_status_reason&gt; | Number of seconds all pipelineruns have taken in pipelines-as-code |
+| `pipelines_as_code_running_pipelineruns_count`       | Gauge   | `namespace`=&lt;pipelinerun_namespace&gt; <br> `repository`=&lt;repository_cr_name&gt;                                                                                          | Number of running pipelineruns in pipelines-as-code                |
 
 **Note:** The metric `pipelines_as_code_git_provider_api_request_count`
 is emitted by both the Controller and the Watcher, since both services