Add troubleshooting item (#5396)

Author: jpipkin1

docs/send-data/kubernetes/troubleshoot-collection.md

@@ -522,6 +522,45 @@ kube-prometheus-stack:
 
 where `metadata.name` is the value from Argo Application manifest.
 
+### Missing metrics in dashboards
+
+Dashboards can miss many metrics from the cluster and pod level. This can occur because the `kube-state-metrics` are not scraped. For example, the `prometheus-kube-state-metrics` ServiceMonitor resource does not have the label `release: prometheus`.
+
+With the `prometheus` label added manually, the dashboards populate correctly and all data is pulled:
+
+```yaml
+serviceMonitorSelector:
+      matchLabels:
+        monitoring: prometheus
+
+kube-state-metrics:
+  prometheus:
+    monitor:
+      enabled: true
+      additionalLabels:
+        monitoring: prometheus
+```
+
+The `release:` label value must match the release name of the `kube-prometheus-stack` Helm deployment. The default should be `release: kube-prometheus-stack`.
+
+To get the release name: 
+
+```text
+pod="$(kubectl get po -n monitoring | awk '/kube-state-metrics/{ print $1 }')"
+kubectl get po -n monitoring "${pod}" -o yaml | grep release
+```
+
+Results:
+
+```yaml
+kube-state-metrics:
+  prometheus:
+    monitor:
+      enabled: true
+      additionalLabels:
+        release: kube-prometheus-stack
+```
+
 ### Check metrics content
 
 You can print metrics on stdout of metrics collector and metrics metadata, and validate if they are correct. It may happen that metrics are ingested, but with different metadata than you expect.