Let's stay close to Varlink's naming rules and insist that metrics prefixes must be valid varlink interface names, and suffixes are valid varlink field names. The former rule is clear: because a metric <x>.<y> can only be provided by a varlink service <x>, it is obvious we should validate them the same way. Validating the suffix via varlink field rules is not that obvious, but I think it makes sense to stay close to Varlink naming rules if we already started out at one place.
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