Like this:
$ curl -s http://localhost:9098/metrics | egrep '^syncthing_discovery_process'
syncthing_discovery_process_cpu_seconds_total 12.92
syncthing_discovery_process_max_fds 10240
syncthing_discovery_process_open_fds 51
syncthing_discovery_process_resident_memory_bytes 1.3674496e+08
syncthing_discovery_process_start_time_seconds 1.52034731837e+09
syncthing_discovery_process_virtual_memory_bytes 1.40324864e+08
stdiscosrv
This is the global discovery server for the syncthing project.