> For the complete documentation index, see [llms.txt](https://developer.harness.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.harness.io/continuous-delivery/use-continuous-delivery/verify-deployments/configure-cv/health-sources/loki.md).
# Grafana Loki
{% hint style="info" %}
**NOTE**
Currently, this feature is behind the feature flag `SRM_ENABLE_GRAFANA_LOKI_LOGS`. Contact [Harness Support](mailto:support@harness.io) to enable the feature.
{% endhint %}
### Before you begin
This page assumes you have followed the rest of the steps to set up CV. To learn more, go to [Configure CV](/continuous-delivery/use-continuous-delivery/verify-deployments/configure-cv/verify-deployments.md)
### Add Grafana Loki as a health source
To add a health source:
1. In the **Health Sources** section of the Verify screen, select **+ Add New Health Source**.
The Add New Health Source dialog appears.
2. In the **Define Health Source** tab, do the following:
1. In the **Define Health Source** section, select **GrafanaLoki** as the health source type.
2. In the **Health Source Name** field, enter a name for the health source.
3. In the **Connect Health Source** section, select **Select Connector**.
The Create or Select an Existing Connector dialog appears.
4. Select a connector for the Grafana Loki health source, and then select **Apply Selected**.\
The selected connector appears in the **Select Connector** dropdown. The **Grafana Loki Logs** option is selected by default in the **Select Feature** field.
Follow these steps to create a new Grafana Loki connector.
```
1. In the Create or Select an Existing Connector dialog, select **+ New Connector**.
2. In the **Overview** tab, enter a name for the connector, an optional description, and a tag, and then select **Continue**. If you are going to use multiple providers of the same type, ensure you give each provider a different name.
3. In the **Headers** tab, enter the following and select **Next**:
- **Base URL** of your Grafana Loki account. By default, Grafana Loki exposes its API on the 3100 port without any authentication.
- Optionally, the **Key** and **Value** pair for the Grafana Loki log stream that you want to select in the query. For more information on the log stream selector and key-value pairs, go to [Log stream selector](https://grafana.com/docs/loki/latest/logql/log_queries/#log-stream-selector).
4. Optionally, in the **Parameters** tab, enter the **Key** and **Value** pair.
5. In the **Validation Path** tab, select either the **GET** or **POST** request method and enter the **Validation Path**.
If you select **POST**, you must also include the request body. Here's an example of a validation path for a **GET** request: `loki/api/v1/labels`.
6. In the **Delegates Setup** tab, choose one of the following:
- **Use any available Delegate**: Harness automatically assigns an available delegate.
- **Only use Delegates with all of the following tags**: You can enter tags to ensure that Harness selects only the delegates that have been assigned those specific tags.
7. Select **Save** and **Continue**.
Harness verifies the connection.
8. Once the verification is successful, select **Finish**.
The Grafana Loki connector is added to the list of connectors.
```
3. Select **Next**. The **Configuration** tab appears.
#### Define log configuration settings
1. In the Configuration tab, select **+ Add Query**.
The Add Query dialog appears.
2. Enter a name for the query and then select **Submit**.
The query that you added gets listed under **Logs Group**. The query specification and mapping settings are displayed. These settings help you retrieve the desired logs from the Grafana Loki platform and map them to the Harness service.
#### Define a query
1. In the **Query** field, enter a log query and select **Run Query** to execute it.
A sample record in the **Records** field. This helps you confirm the accuracy of the query you've constructed.
2. In the **Field Mapping** section, select **+** to map the **service instance identifiers** to select the data that you want to be displayed from the logs. For more information, go to [Service Instance Identifier (SII)](/continuous-delivery/use-continuous-delivery/verify-deployments/verify-deployments-with-the-verify-step.md#service-instance-identifier-sii).
3. Select **Get sample log messages**.
Sample logs are displayed that help you verify if the query is correct.
Sample log query
Query for showing data from all filenames, except for syslog: `{filename=~".+",filename!="/var/log/syslog"}`
