Github user HeartSaVioR commented on a diff in the pull request: https://github.com/apache/spark/pull/21622#discussion_r198300792 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/MetricsReporter.scala --- @@ -39,6 +42,23 @@ class MetricsReporter( registerGauge("processingRate-total", _.processedRowsPerSecond, 0.0) registerGauge("latency", _.durationMs.get("triggerExecution").longValue(), 0L) + private val timestampFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'") // ISO8601 + timestampFormat.setTimeZone(DateTimeUtils.getTimeZone("UTC")) + + registerGauge("eventTime-watermark", + s => convertStringDateToMillis(s.eventTime.get("watermark")), 0L) --- End diff -- 1. will address 2. We don't know whether the map will be empty when calling `registerGauge`, and once we register the metric, `getValue` in Gauge is called from Dropwizard so I'm not sure we can control whether reporting the value or not.
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