Added boilerplate for Prometheus

.docker/prometheus/alert.yml

@@ -0,0 +1,6 @@
+groups:
+  - name: DemoAlerts
+    rules:
+      - alert: InstanceDown 
+        expr: up{job="services"} < 1 
+        for: 5m

.docker/prometheus/prometheus.yml

@@ -0,0 +1,17 @@
+global:
+  scrape_interval: 30s
+  scrape_timeout: 10s
+
+rule_files:
+  - alert.yml
+
+scrape_configs:
+  - job_name: services
+    metrics_path: /metrics
+    static_configs:
+      - targets:
+          - 'prometheus:9090'
+  - job_name: 'file_ds'
+    file_sd_configs:
+    - files:
+      - targets.json

.docker/prometheus/targets.json

@@ -0,0 +1,10 @@
+[
+    {
+        "targets": [
+            "api:9091"
+        ],
+        "labels": {
+            "job": "5f11-api"
+        }
+    }
+]

docker-compose.yml

@@ -4,8 +4,28 @@ services:
   scylla:
     image: scylladb/scylla
     ports:
-      - "7000:7000"
-      - "7001:7001"
-      - "9042:9042"
-      - "9160:9160"
-      - "10000:10000"
+      - 7000:7000
+      - 7001:7001
+      - 9042:9042
+      - 9160:9160
+      - 10000:10000
+    volumes:
+      - .docker/scylla/scylla.yaml:/etc/scylla/scylla.yaml
+  prometheus:
+    image: prom/prometheus:v2.30.3
+    ports:
+      - 9090:9090
+    volumes:
+      - .docker/prometheus:/etc/prometheus
+      - prometheus-data:/prometheus
+    command: --web.enable-lifecycle  --config.file=/etc/prometheus/prometheus.yml
+  # api:
+  #   build:
+  #     context: .
+  #   ports:
+  #     - 5111:5111
+  #   depends_on:
+  #     - scylla
+
+volumes:
+  prometheus-data:

etc/fivefeeteleven-api.yaml

@@ -4,4 +4,8 @@ Host: 0.0.0.0
 Port: 5111
 ScyllaDB:
   Hosts:
-    - "localhost"
+    - localhost
+# Prometheus:
+#   Host: 0.0.0.0
+#   Port: 9091
+#   Path: /metrics