prom: initial docker block for prometheus 2

docker/blocks/prometheus2/Dockerfile

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+FROM prom/prometheus:v2.0.0
+ADD prometheus.yml /etc/prometheus/
+ADD alert.rules /etc/prometheus/

docker/blocks/prometheus2/alert.rules

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+# Alert Rules
+
+ALERT AppCrash
+  IF process_open_fds > 0
+  FOR 15s
+  LABELS { severity="critical" }
+  ANNOTATIONS {
+   summary = "Number of open fds > 0",
+   description = "Just testing"
+  }

docker/blocks/prometheus2/prometheus.yml

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+# my global config
+global:
+  scrape_interval:     10s # By default, scrape targets every 15 seconds.
+  evaluation_interval: 10s # By default, scrape targets every 15 seconds.
+  # scrape_timeout is set to the global default (10s).
+
+# Load and evaluate rules in this file every 'evaluation_interval' seconds.
+#rule_files:
+# - "alert.rules"
+# - "first.rules"
+# - "second.rules"
+
+# alerting:
+#   alertmanagers:
+#   - scheme: http
+#     static_configs:
+#     - targets:
+#       - "127.0.0.1:9093"
+
+scrape_configs:
+  - job_name: 'prometheus'
+    static_configs:
+      - targets: ['localhost:9090']
+
+  - job_name: 'node_exporter'
+    static_configs:
+      - targets: ['127.0.0.1:9100']
+ 
+  - job_name: 'fake-data-gen'
+    static_configs:
+      - targets: ['127.0.0.1:9091']
+  
+  - job_name: 'grafana'
+    static_configs:
+      - targets: ['127.0.0.1:3000']