Looks like it's this one: https://prometheus.io/docs/prometheus/latest/configuration/configuration/#nerve_sd_config
If you look in the source code that you found: https://github.com/prometheus/prometheus/blob/master/discovery/zookeeper/zookeeper.go you'll see NerveSDConfig -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to prometheus-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/ca884dc3-021c-4065-b0f3-7e1828000765%40googlegroups.com.