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Document that metric sinks aggregate metrics within a batch
Most of the metric sinks aggregate metrics within a batch. That is, incremental metrics are added together and absolute metrics are replaced by the later value. As noted by https://github.com/timberio/vector/pull/7846#pullrequestreview-686985284 this is not adequately described in the documentation for those sinks. This applies to the following sinks:
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aws_cloudwatch_metrics
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datadog_metrics
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stackdriver_metrics
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influxdb_metrics
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prometheus_exporter
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prometheus_remote_write
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sematext_metrics