Full observability for functions built on Cloud Functions for Firebase (2nd gen) is not yet available in the Firebase console. You can view the Google Cloud Console to monitor the underlying Cloud Run service. This console gives you basic overviews of your Cloud Run service and your most common metrics. You can find more metrics for your Cloud Run Revisions (what's a Revision?) in the Metrics explorer.
Viewing logs for your functions
Complete logging detail for functions built on Cloud Functions for Firebase (2nd gen) currently is not displayed in the Firebase console. You can view logs from the underlying Cloud Run service in the Google Cloud Logs Explorer.
Viewing traces for your functions
Cloud Run automatically traces requests that reach Google’s front-end load balancer and at our last-mile load balancer called the "AppServer". You can view these traces, along with any others you instrument in your app, in the Trace list for your Google Cloud project.