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[Java] Add Gauge Metric Extraction to DataflowMetrics #34307

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This PR addresses issue #33448, where gauge metrics were not being extracted into the metrics results in the Dataflow runner, preventing users from querying them programmatically. The root cause was that DataflowMetrics.DataflowMetricResultExtractor.addMetricResult did not handle gauge metrics from MetricUpdate objects returned by the Dataflow API.

Closes #33448

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R: @lostluck added as fallback since no labels match configuration

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assign to next reviewer

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R: @rohitsinha54

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R: @damondouglas added as fallback since no labels match configuration

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Reminder, please take a look at this pr: @damondouglas

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R: @damondouglas added as fallback since no labels match configuration

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I need to be removed from the fallback list, but for now, let me ping @kennknowles or @robertwb to take a look at this. IIRC Dataflow doesn't actually support Gauge metrics, so there wouldn't be any to extract...

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R: @Naireen

if (metricUpdate.getGauge() == null) {
return GaugeResult.empty();
}
Object gaugeValue = metricUpdate.getGauge();
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It has been a while since I thought about gauge metrics. I know that @Naireen worked on them some time. I am not sure what the spec here is, since the protobuf is so generic. I am trying to find a design doc for a reference but maybe @Naireen can tell us.

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@Naireen please take a look

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[Bug]: Gauge metrics are not extracted in metrics result.
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