L2SS-685: Added docker image for alerta + backing postgres database

docker-compose/alerta.yml

+version: '2.1'
+
+volumes:
+  alerta-postgres-data: {}
+
+services:
+  alerta-web:
+    image: alerta/alerta-web
+    container_name: alerta-web
+    networks:
+      - control
+    ports:
+      - "8081:8080"
+    depends_on:
+      - alerta-db
+    environment:
+      - DEBUG=1  # remove this line to turn DEBUG off
+      - DATABASE_URL=postgres://postgres:postgres@alerta-db:5432/monitoring
+      - AUTH_REQUIRED=True
+      - ADMIN_USERS=admin #default password: alerta
+      - ADMIN_KEY=demo-key
+      - PLUGINS=reject,blackout,normalise,enhance
+    restart: always
+
+  alerta-db:
+    image: postgres
+    container_name: alerta-db
+    networks:
+      - control
+    volumes:
+      - alerta-postgres-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_DB: monitoring
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+    restart: always

tangostationcontrol/docs/source/interfaces/overview.rst

@@ -10,6 +10,8 @@ The station provides the following interfaces accessible through your browser (a
 +---------------------+---------+----------------------+-------------------+
 | :doc:`monitoring`   |Grafana  |http://localhost:3000 |admin/admin        |
 +---------------------+---------+----------------------+-------------------+
+| Alerting            |Alerta   |http://localhost:8081 |admin/alerta       |
++---------------------+---------+----------------------+-------------------+
 | :doc:`logs`         |Kibana   |http://localhost:5601 |                   |
 +---------------------+---------+----------------------+-------------------+