Code for step 2

config/config.exs

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+use Mix.Config
+
+config :elixir_popularity, ecto_repos: [ElixirPopularity.Repo]
+
+config :elixir_popularity, ElixirPopularity.Repo,
+  database: "elixir_popularity_repo",
+  username: "postgres",
+  password: "postgres",
+  hostname: "localhost",
+  log: false
+
+config :logger, :console, format: "[$level] $message\n"

docker-compose.yml

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+version: '3.7'
+
+services:
+  cadvisor:
+    image: google/cadvisor:v0.33.0
+    ports:
+      - '8080:8080'
+    volumes:
+      - /:/rootfs:ro
+      - /var/run:/var/run:ro
+      - /sys:/sys:ro
+      - /var/lib/docker/:/var/lib/docker:ro
+
+  rabbitmq:
+    image: rabbitmq:3.8
+    ports:
+      - '5672:5672'
+      - '15672:15672'
+      - '15692:15692'
+    volumes:
+      - ./docker/rabbitmq/plugins:/etc/rabbitmq/enabled_plugins
+      - ./docker/rabbitmq/rabbitmq.conf:/etc/rabbitmq/rabbitmq.conf:ro
+      - rabbitmq-data:/var/lib/rabbitmq
+
+  postgres:
+    image: postgres:12.0
+    ports:
+      - '5432:5432'
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_USER: postgres
+
+  postgres_exporter:
+    image: wrouesnel/postgres_exporter:v0.7.0
+    ports:
+      - '9187:9187'
+    depends_on:
+      - postgres
+    environment:
+      DATA_SOURCE_USER: postgres
+      DATA_SOURCE_PASS: postgres
+      DATA_SOURCE_URI: postgres:5432/?sslmode=disable
+
+  grafana:
+    image: grafana/grafana:6.4.4
+    depends_on:
+      - prometheus
+    ports:
+      - '3000:3000'
+    volumes:
+      - grafana-data:/var/lib/grafana
+      - ./docker/grafana/:/etc/grafana/provisioning/
+    env_file:
+      - ./docker/grafana/.env
+
+  prometheus:
+    image: prom/prometheus:v2.13.0
+    ports:
+      - '9090:9090'
+    volumes:
+      - ./docker/prometheus/:/etc/prometheus/
+      - prometheus-data:/prometheus
+    command:
+      - '--config.file=/etc/prometheus/config.yml'
+      - '--storage.tsdb.path=/prometheus'
+      - '--web.console.libraries=/usr/share/prometheus/console_libraries'
+      - '--web.console.templates=/usr/share/prometheus/consoles'
+
+volumes:
+  postgres-data: {}
+  rabbitmq-data: {}
+  prometheus-data: {}
+  grafana-data: {}

docker/grafana/.env

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+GF_SECURITY_ADMIN_PASSWORD=admin
+GF_USERS_ALLOW_SIGN_UP=false