diff --git a/documentation/prometheus-mixin/config.libsonnet b/documentation/prometheus-mixin/config.libsonnet
index bb4099132a..27614289ab 100644
--- a/documentation/prometheus-mixin/config.libsonnet
+++ b/documentation/prometheus-mixin/config.libsonnet
@@ -1,8 +1,9 @@
 {
   _config+:: {
-    // Selectors are inserted between {} in Prometheus queries.
+    // prometheusSelector is inserted as part of the label selector in
+    // PromQL queries to identify metrics collected from Prometheus
+    // servers.
     prometheusSelector: 'job="prometheus"',
-    alertmanagerSelector: 'job="alertmanager"',
 
     // prometheusName is inserted into annotations to name the Prometheus
     // instance affected by the alert.
diff --git a/documentation/prometheus-mixin/dashboards.libsonnet b/documentation/prometheus-mixin/dashboards.libsonnet
index c7df870132..cc4dba2b80 100644
--- a/documentation/prometheus-mixin/dashboards.libsonnet
+++ b/documentation/prometheus-mixin/dashboards.libsonnet
@@ -6,8 +6,6 @@ local g = import 'grafana-builder/grafana.libsonnet';
       g.dashboard('Prometheus')
       .addMultiTemplate('job', 'prometheus_build_info', 'job')
       .addMultiTemplate('instance', 'prometheus_build_info', 'instance')
-      # Prometheus is quite commonly configured with honor_labels set to true;
-      # therefore job and instance is not the prometheus server in many queries!
       .addRow(
         g.row('Prometheus Stats')
         .addPanel(