Hi, great question! We are slowly adding metrics to Airbyte as we learn more while operating Cloud. In general our philosophy is to expose as many things as possible in OSS, so expect the list of available metrics to increase over time. You can see the list of available metrics today at:
https://github.com/airbytehq/airbyte/blob/master/airbyte-metrics/lib/src/main/java/io/airbyte/metrics/lib/MetricsRegistry.java
In terms of supported metric systems, we moved away from promtheus as it was inferior compared to the native DD client. We are currently looking into Open Telemetry, and it is highly likely we’ll be exposing things via OT in the next few months