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Public Interfaces

New metrics

consumer-coordinator-metrics

The metric will have the following tags:

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Currently, each partition's internal state tracks whether it is paused with a simple boolean flag. To support the `paused-partitions-duration-seconds` metric, this KIP adds a timestamp that records when the partition was paused. The timestamp is set when pause() is called, cleared (reset to -1) when resume() is called, and also reset to -1 on partition reassignment regardless of prior pause status. This ensures that a partition re-assigned to the same consumer after a rebalance starts with a clean pause state.

consumer-coordinator-metrics

A `paused-partitions-count` gauge is registered in the consumer's top-level metrics. When queried, this gauge computes the current count of paused partitions by reading from the consumer's subscription state. Since the consumer already maintains the set of paused partitions internally, no additional data structures are needed for this metric.

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