How to show the number of application instances in grafana?

@rollin 

To show the number of application instances in Grafana, you can use a query in a graph panel to count the number of instances. Here's how you can do it:

1. Add a new graph panel to your dashboard in Grafana.
2. In the panel settings, select the data source that contains the logs or metrics for your application instances.
3. In the query editor, write a query that counts the number of instances. This will depend on how your data is structured. For example, if each instance logs a specific metric that can be used to identify it, you can use a query like: COUNT(instance_id).
4. Choose the appropriate time range and refresh interval for your dashboard.
5. Save the panel and view your dashboard to see the number of application instances displayed in the graph.

You can also customize the graph display by applying filters, grouping, and other options available in the Grafana interface. This way, you can visualize and track the number of application instances over time.