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Document payload types of messages sent to metricsChannel
Closes gh-7790
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@ -1448,10 +1448,12 @@ replaced with a `DropwizardMetricServices`, which is a wrapper around the `Metri
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[[production-ready-metrics-message-channel-integration]]
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=== Message channel integration
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If a `MessageChannel` bean called `metricsChannel` exists, then a `MetricWriter` will be
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created that writes metrics to that channel. The writer is automatically hooked up to an
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exporter (as for all writers), so all metric values will appear on the channel, and
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additional analysis or actions can be taken by subscribers (it's up to you to provide the
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channel and any subscribers you need).
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created that writes metrics to that channel. Each message sent to the channel will contain
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a {dc-spring-boot-actuator}/metrics/writer/Delta.{dc-ext}[`Delta`] or
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{dc-spring-boot-actuator}/metrics/Metric.{dc-ext}[`Metric`] payload and have a `metricName`
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header. The writer is automatically hooked up to an exporter (as for all writers), so all
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metric values will appear on the channel, and additional analysis or actions can be taken
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by subscribers (it's up to you to provide the channel and any subscribers you need).
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