Noticed this while investigating something else, metrics exposed by jmx_exporter running on wdqs-updater should be prefixed with wdqs_updater_ to make it more clear what they are referring to. I believe this can be achieved either via jmx_exporter config via rules or by Prometheus server itself at scrape time, with the former being preferred IMO.
wdqs1004:~$ curl -s localhost:9101/metrics | grep -v ^# | grep metrics metrics_rdf_fetch_timer_98thPercentile 153.172966 metrics_constraint_fetch_timer_StdDev 13.365816886763675 metrics_kafka_changes_timer_Count 93957.0 metrics_rdf_fetch_timer_Min 78.93668199999999 metrics_kafka_changes_timer_MeanRate 0.2910079145414642 metrics_rdf_fetch_timer_75thPercentile 113.298346