Event analytics in OpenSearch Observability allow you to create data visualizations using [Piped Processing Language]({{site.url}}{{site.baseurl}}/search-plugins/sql/ppl/index/) (PPL) queries.
To get started, choose **Observability** in OpenSearch Dashboards and then choose **Logs**. If you want to start exploring without adding your own data, choose **Add samples**. Dashboards adds sample visualizations you can interact with. You can also try out preconfigured analytics in [OpenSearch Playground](https://playground.opensearch.org/app/observability-logs#/).
To generate custom visualizations, you must first specify a PPL query. OpenSearch Dashboards then automatically creates a visualization based on your query results.
By default, Dashboards shows results from the last 15 minutes of your data. To see data from a different time frame, use the date and time selector to choose the desired settings.
This is an experimental feature and is not recommended for use in a production environment. For updates on the progress of the feature or if you want to leave feedback, see the associated [OpenSearch forum thread](https://forum.opensearch.org/t/feedback-opensearch-assistant/16741).
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To simplify query building, the **OpenSearch Assistant** toolkit offers an assistant that converts natural language queries into PPL. A screenshot is shown in the following image.
To set up **Query Assistant**, follow the steps in the [Getting started guide](https://github.com/opensearch-project/dashboards-assistant/blob/main/GETTING_STARTED_GUIDE.md) on GitHub. This guide provides step-by-step setup instructions for **OpenSearch Assistant** and **Query Assistant**. To set up **Query Assistant** only, use the `query-assist-agent` template included in the guide.
After Dashboards generates a visualization, save it if you want to revisit it or include it in an [operational panel]({{site.url}}{{site.baseurl}}/observing-your-data/operational-panels). To save a visualization, expand the **Save** dropdown menu in the upper-right corner, enter a name for the visualization, and then select the **Save** button. You can reopen saved visualizations on the event analytics page.
This feature is available in OpenSearch Dashboards 2.7 and later. It works with new visualizations that use PPL to query data from OpenSearch or federated data sources such as Prometheus.
2. From the **Observability** > **Logs** > **Explorer** window, enter the index source in the **PPL query** field, for example, `source = opensearch_dashboards_sample_data_flights | stats count() by DestCountry`. You must enter the query using PPL syntax.
4. In the **Add panels** window, choose **PPL** from the **Types** dropdown menu, and then select the visualization. It is now displayed on your dashboard.
6. To add more visualizations to the dashboard, choose **Select existing visualization** and follow steps 1--5. Alternatively, choose **Create new** and then select **PPL** in the **New Visualization** window. You'll return to the event analytics page and follow steps 1--5 in the preceding instructions.
The following demo provides an overview of creating event analytics visualizations and adding them to a dashboard.
Event analytics visualizations currently do not support [Dashboards Query Language (DQL)]({{site.url}}{{site.baseurl}}/dashboards/discover/dql/) or [query domain-specific language (DSL)]({{site.url}}{{site.baseurl}}/query-dsl/index/), and they do not use index patterns. Note the following limitations:
- Event analytics visualizations only use filters created using the dropdown interface. If you have DQL query or DSL filters in a dashboard, the visualizations do not use them.
- The **Dashboard** filter dropdown interface only shows fields from the default index pattern or index patterns used by other visualizations in the same dashboard.
If you regularly track events across applications, you can correlate logs and traces. To view correlations, you must index the traces according to OpenTelemetry standards, similarly to [trace analytics]({{site.url}}{{site.baseurl}}/observing-your-data/trace/index/). Once you add a `TraceId` field to your logs, you can view the correlated trace information in the event explorer log details. This method correlates logs and traces that correspond to the same execution context. The following demo shows this feature in action.
If you need more information about a log event, you can select **View surrounding events** to gain a more comprehensive understanding of the context around the time of interest. The following demo shows this feature in action.
If you prefer real-time monitoring, you can set up an interval at which event analytics content will be automatically refreshed. With Live Tail, you can stream logs directly to OpenSearch Observability event analytics using the specified PPL query while leveraging robust features like filters. This can enhance your debugging process and enables seamless real-time monitoring of logs without the need to manually refresh content.
With Live Tail, you can select intervals and seamlessly switch between them to control the frequency of live log streaming. This functionality is similar to the `tail -f` CLI command, as it retrieves only the most recent live logs, potentially eliminating a significant portion of live logs. Live Tail displays the total number of live logs received by OpenSearch during the live stream, offering insight into incoming traffic patterns. The following demo shows this feature in action.
- [Demonstrating the OpenSearch Assistant toolkit](https://www.youtube.com/watch?v=VTiJtGI2Sr4&t=152s)
- [Getting started guide for OpenSearch Assistant in OpenSearch Dashboards](https://github.com/opensearch-project/dashboards-assistant/blob/main/GETTING_STARTED_GUIDE.md)
- OpenSearch Assistant configuration through the REST API
