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Dennis Zhuang
6b889e4408
A composite entity id rendered the identifying columns as sorted `col=value` pairs, so the same identity split into one entity per signal: a trace table names its columns service_name and resource_attributes.service.instance.id where a metric table names them job and instance. One service instance became two nodes with two parallel edge sets, breaking the walk from a trace to that instance's metrics. Render an id as its values in declared order instead, escaping the separator so components stay distinguishable, which is what single-column ids already did by keeping only the value. entity_id_attrs still carries the structured form. Values alone are not enough for a namespaced service: the metric side folds service.namespace into job while traces keep the bare name. Add qualified_by to the conventions so the trace declarations compose the namespace the same way, per the OTel rule that job is <service.namespace>/<service.name> or the bare name when the namespace is empty. A table without the namespace column keeps the unqualified identity rather than losing the declaration. Conventions validation now rejects one entity type declared with a different number of id columns by two sources, which would silently produce ids that can never match. Signed-off-by: Dennis Zhuang <killme2008@gmail.com>