Monitoring
The managed OPA instances are automatically configured to export Prometheus metrics. See Monitoring for more details.
You can read the list of exported metrics in the OPA monitoring documentation.
Especially worth mentioning are the Status metrics, which contain e.g. opa_info, bundle_loaded_counter and bundle_failed_load_counter.
You can use these to create a dashboard to see any bundle loading problems at a glance.
You can also set up alerts to get notified proactively.