feat: add notes to all applications

src/content/docs/applications/kube-prometheus-stack.mdx

@@ -13,3 +13,21 @@ hero:
       link: https://gitea.alexlebens.dev/alexlebens/infrastructure/src/branch/main/clusters/cl01tl/helm/kube-prometheus-stack
       icon: right-arrow
 ---
+
+import { Aside } from '@astrojs/starlight/components';
+
+<Aside type="tip">Has an internal [Grafana Dashboard](https://grafana.alexlebens.net/goto/dfit8q7ooq7eod?orgId=1).</Aside>
+
+<Aside type="tip">AirGradient has an internal [Grafana Dashboard](https://grafana.alexlebens.net/goto/ffit86ggcrxtse?orgId=1).</Aside>
+
+# Purpose
+
+Community managed and combined stack for Prometheus metrics. Also includes alerting.
+
+# Notes
+
+Metrics are stored on iSCSI, retention is 45 days.
+
+Sends alert notifications through [ntfy](https://docs.alexlebens.dev/applications/ntfy/).
+
+Scrapping for targets outside of cluster has their ServiceMonitors placed in this chart, such as for IoT devices.