You can use your exported Crashlytics and (optionally) Firebase sessions data in Cloud Logging to create custom dashboards.
Create custom dashboards in the Logs Dashboard
After you've created log-based metrics for your exported data, you can visualize them on custom dashboards within Cloud Logging.
Note that Crashlytics does not yet have a predefined dashboard within Cloud Logging.
Make sure that you've created at least one log-based metric for your exported data.
In the Google Cloud console, select Logging > Dashboards.
Click Create custom dashboard.
Add charts to your dashboard:
Click Add widget.
From the Metric drop-down, select the log-based metric you previously created.
Configure the aggregation and display options as needed.
Save the chart.
Arrange and resize charts to create your preferred dashboard layout.
Save the dashboard.
Build charts and dashboards using Cloud Monitoring
After you've created log-based metrics for your exported data, you can use Cloud Monitoring to create charts and build custom dashboards.
Charts are temporary and let you quickly visualize your data in the Metrics Explorer, while dashboards offer more permanent and powerful options for longer-term and more advanced monitoring. You can even save a chart to a custom dashboard.