diff --git a/service/prometheus.md b/service/prometheus.md
index 7853f8c1fb466690d7262ab0002ea792c3f7392c..cbaba0dfc2ae824a1bb9312249875c3b68933f8c 100644
--- a/service/prometheus.md
+++ b/service/prometheus.md
@@ -1032,8 +1032,8 @@ See also the [CPU][], [memory][], and [disk][] dashboards.
 
 [Number of machines]: https://prometheus.torproject.org/graph?g0.expr=count(up{job%3D"node"})
 [Number of machine per OS version]: https://prometheus.torproject.org/graph?g0.expr=count(node_os_info)+by+(version_id,+version_codename)
-[Number of machines per exporters]: https://prometheus.torproject.org/graph?g0.expr=sort_desc(sum(up{job%3D~\"$job\"})+by+(job)
-[Number of CPU cores, memory size, file system and LVM sizes]: https://prometheus.torproject.org/graph?g0.expr=count(node_cpu_seconds_total{classes%3D~\"$class\",mode%3D\"system\"})
+[Number of machines per exporters]: https://prometheus.torproject.org/graph?g0.expr=sort_desc(sum(up{job%3D~"$job"})+by+(job)
+[Number of CPU cores, memory size, file system and LVM sizes]: https://prometheus.torproject.org/graph?g0.expr=count(node_cpu_seconds_total{classes%3D~"$class",mode%3D"system"})
 [Uptime, in days]: https://prometheus.torproject.org/graph?g0.expr=round((time()+-+node_boot_time_seconds)+/+(24*60*60))
 [CPU]: https://grafana.torproject.org/d/gex9eLcWz/cpu-usage
 [memory]: https://grafana.torproject.org/d/amgrk2Qnk/memory-usage