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Docs: Add section about derived fields for Loki (#20648)

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Andrej Ocenas 2019-12-03 23:38:25 +01:00 committed by GitHub
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docs/sources/features/datasources/loki.md
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@ -36,6 +36,25 @@ Just add it as a data source and you are ready to query your log data in [Explor
| _URL_ | The URL of the Loki instance, e.g., `http://localhost:3100` |
| _Maximum lines_ | Upper limit for number of log lines returned by Loki (default is 1000). Decrease if your browser is sluggish when displaying logs in Explore. |
### Derived fields
The Derived Fields configuration allows you to:
* Add fields parsed from the log message.
* Add a link that uses the value of the field.
You can use this functionality to link to your tracing backend directly from your logs, or link to a user profile page if a userId is present in the log line. These links will be shown in the [log details](/features/explore/#labels-and-parsed-fields).
{{< docs-imagebox img="/img/docs/v65/loki_derived_fields.png" class="docs-image--no-shadow" caption="Screenshot of the derived fields configuration" >}}
Each derived field consists of:
- **Name:** Shown in the log details as a label.
- **Regex:** A Regex pattern that runs on the log message and captures part of it to as the value of the new field. Can only contain capture a single group.
- **URL**: A URL template used to construct a link next to the field value in log details. Use special `${__value.raw}` value in your template to interpolate the real field value into your URL template.
You can use a debug section to see what your fields extract and how the URL is interpolated. Click **Show example log message** to show the text area where you can enter a log message.
{{< docs-imagebox img="/img/docs/v65/loki_derived_fields_debug.png" class="docs-image--no-shadow" caption="Screenshot of the derived fields debugging" >}}
The new field with the link shown in log details:
{{< docs-imagebox img="/img/docs/v65/loki_derived_fields_detail.png" class="docs-image--no-shadow" caption="Screenshot of the derived field in log detail" >}}
## Querying Logs
Querying and displaying log data from Loki is available via [Explore](/features/explore), and with the [logs panel](/features/panels/logs/) in dashboards. Select the Loki data source, and then enter a log query to display your logs.
@ -152,7 +171,7 @@ datasources:
maxLines: 1000
```
Here's another with basic auth:
Here's another with basic auth and derived field. Keep in mind that `$` character needs to be escaped in yaml values as it is used to interpolate environment variables:
```yaml
apiVersion: 1
@ -167,4 +186,9 @@ datasources:
basicAuthPassword: test_password
jsonData:
maxLines: 1000
derivedFields:
- datasourceName: Jaeger
matcherRegex: "traceID=(\\w+)"
name: TraceID
url: "http://localhost:16686/trace/$${__value.raw}"
```