Metadata is supported in any HA supported protocol. Your concern is what?
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but as the Matter standard doesn't yet support energy monitoring, users are limited to basic features like on and off and scheduling
- from this link
Granted the article is almost a year old. But I just didn't realize that Matter now supports energy monitoring. Somehow I just missed that news.
It looks like it got added in the protocol V1.3 and then further refined in 1.4: https://csa-iot.org/newsroom/matter-1-4-enables-more-capable-smart-homes/
Yep just saw that too after I researched it a bit more. What is strange is I don't remember Eve Energy having a firmware update since then. Makes me wonder if they had it ready to go in previous firmware versions based on internal specs they saw? Or maybe I just forgot about a firmware update I did.
Matter itself is different from data passing through HA.