migrate to v4

public/v4/apps/prometheus.yml

@@ -0,0 +1,23 @@
+captainVersion: 4
+services:
+  $$cap_appname:
+    image: prom/prometheus@$$cap_version
+    restart: always
+    volumes:
+      - $$cap_appname-config:/etc/prometheus
+      - $$cap_appname-data:/prometheus
+    caproverExtra:
+      containerHttpPort: "9090"
+caproverOneClickApp:
+  variables:
+    - label: Prometheus Docker Hash
+      defaultValue: sha256:43b19072ef98fd0ea5a29ac794fbadf365cca6d5247830034c7b86ae9650126c
+      description: Starts with 'sha256:'.  Find on Docker Hub.  Default is latest as of 2020-06-30.
+      id: $$cap_version
+  instructions:
+    end: Prometheus is now starting.
+    start: "Read more about Prometheus: https://prometheus.io/"
+  displayName: Prometheus
+  isOfficial: true
+  description: Prometheus is a systems and service monitoring system.
+  documentation: https://hub.docker.com/r/prom/prometheus/