Is it possible to set service-level meta directly in the catalog, i.e. without going through any of the service definitions on the nodes providing that service?
It is possible to override specific tags on a service (not meta) by setting
enable_tag_override on the service definition, and then updating the tags in the catalog. See Enable Tag Override and Anti-Entropy for more info.
Would this work for your use case, or do you specifically require the ability to centrally configure service metadata?