monitoring - increase scrapeInterval to 120s, better selectors on Agent and memory decrease of agent from 360MB to 228MB

monitoring/prometheus/deploy/README.md

@@ -29,6 +29,16 @@ helm upgrade --install prometheus-stack prometheus-community/kube-prometheus-sta
 
 ## deploy prometheus agent
 
+**requirements:**
+
+On namespaces running prometheus monitors add label `prometheus-monitoring=enabled`
+
+**Example:**
+
+``` bash
+kubectl label namespace monitoring prometheus-monitoring=enabled --overwrite
+```
+
 ```bash
 kubectl apply -f ./prometheus-agent.yaml
 ```