dapr / dapr/components-contrib
MQTT pubsub to offer metadata for retained messages
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good first issue
kind/enhancement
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Description
## Describe the feature
Today, MQTT pubsub offers the `retain` attribute in the component as a global setting - meaning that every message published with that component will have its value set to true. On the other hand, applications might require only some messages to be set as retained (since only one retained message is allowed per topic). This feature request is to allow `retain` attribute to be overwritten per message metadata on publish call as well.
## Release Note
RELEASE NOTE: Support `retain` per message metadata in MQTT publish
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