Add prom1, Prometheus server

source/resources/apps/prometheus/README

@@ -0,0 +1,16 @@
+apt update
+# Stretch:
+apt install -t stretch-backports prometheus
+# Buster:
+apt install prometheus
+
+# On main prom1 server, running buster:
+apt install prometheus-alertmanager prometheus prometheus-node-exporter
+
+# Open up ports on firewall:
+# Prometheus
+-A INPUT -p tcp --dport 9090 -j ACCEPT
+-A INPUT -p tcp --dport 9093 -j ACCEPT
+-A INPUT -p tcp --dport 9094 -j ACCEPT
+-A INPUT -p tcp --dport 9100 -j ACCEPT
+