ibzib opened a new pull request #11369: [BEAM-9600] Get metrics in Flink uber jar job server. URL: https://github.com/apache/beam/pull/11369 Accumulators are visible in the Flink REST API at the `/accumulators` endpoint, including the Beam Flink runner's custom accumulator, `__metricscontainers`. The value of each accumulator is printed using the accumulator's `toString` method. Previously, `MetricsContainerStepMap::toString` printed some sort of bespoke format. In this PR, I change it to use the JSON representation of the underlying protos so it's easy to parse on the Python side. This implementation ignores `committed` metrics. My understanding is that the Flink runner doesn't support them anyway, so I assume the distinction isn't important here. ------------------------ Thank you for your contribution! 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