feat: add notes

src/content/docs/applications/descheduler.mdx

@@ -13,3 +13,11 @@ hero:
       link: https://gitea.alexlebens.dev/alexlebens/infrastructure/src/branch/main/clusters/cl01tl/helm/descheduler
       icon: right-arrow
 ---
+
+# Purpose
+
+Automated service that balances pods across the nodes according to configuration.
+
+# Notes
+
+Mostly used to balance number of pods. Current limit is set to 200 which is nearly twice the defaults, but this can sometimes be met during reboots during upgrades as pods are evicted. Then this will balance out one all nodes are healthy again.