[flink] Emit event time lag should not increase when no new records are read #4281
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Purpose
Currently for source with consumers,
currentEmitEventTimeLagwill continue to increase even if no new records are read. According to the definition of this metrics, this time lag is the different between the event time and the emit time of the last record.This PR fixes the issue by sticking to the definition of the metrics.
Tests
Unit tests.
API and Format
No format changes.
Documentation
No new feature.