Add tagged subscriptions - #217
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This is meant for situations where one process subscribes to the same
topic multiple times independently and wants to differentiate the different
subscriptions - or - a process subscribes to two different topics that share
the same message format and wants to differentiate the topics.
In this case, it can now add a tag when subscribing and messages will arrive
as `{tag, message}` instead of `message`, assuming the default dispatcher is
used or the custom dispatcher handles tagging.
josevalim
reviewed
Aug 25, 2026
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| Applies a subscription's tag to `message`. |
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Do we really need this? Custom dispatchers could just implement their own tags themselves.
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This is meant for situations where one process subscribes to the same topic multiple times independently and wants to differentiate the different subscriptions - or - a process subscribes to two different topics that share the same message format and wants to differentiate the topics.
In this case, it can now add a tag when subscribing and messages will arrive as
{tag, message}instead ofmessage, assuming the default dispatcher is used or the custom dispatcher handles tagging.