Github user arunmahadevan commented on the issue: https://github.com/apache/spark/pull/21721 @HyukjinKwon yes we can mark it unstable. Like I mentioned multiple times in previous comments the traits added here like CustomMetrics, SupportsCustomReaderMetrics etc have nothing specific to micro batch or continuous mode and un-affected when we finally start reporting progress for continuous mode. The way to collect and report metrics in continuous mode needs to be figured out and I think should be discussed in respective JIRAs.
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