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ansible/roles/prometheus/templates/prometheus.yml.j2

@@ -3,9 +3,15 @@ global:
   evaluation_interval: 15s
 
 scrape_configs:
-  - job_name: "node"
+  - job_name: "node-exporter"
     static_configs:
       - targets:
           - "{{ hostvars['monitoring-1'].ansible_host }}:9100"
           - "{{ hostvars['app-1'].ansible_host }}:9100"
+
+  - job_name: "flask_app"
+    metrics_path: /metrics
+    static_configs:
+      - targets:
+          - "{{ hostvars['app-1'].ansible_host }}:80"
 

app/requirements.txt

@@ -1,3 +1,4 @@
 flask==3.0.0
 gunicorn==21.2.0
+prometheus-client
 

app/src/routes/metrics.py

@@ -1,15 +1,27 @@
-import random
 import time
 
-from flask import Blueprint, jsonify
+from flask import Blueprint
+from prometheus_client import CONTENT_TYPE_LATEST, Gauge, generate_latest
 
 metrics_bp = Blueprint("metrics", __name__)
 
 start_time = time.time()
 
+uptime_gauge = Gauge("app_uptime_seconds", "App uptime in seconds")
+random_gauge = Gauge("app_random_value", "Random value")
 
-@metrics_bp.route("/metrics/custom")
+start_time = time.time()
+
+
+@metrics_bp.route("/metrics")
 def metrics():
-    uptime = time.time() - start_time
-    random_value = random.randint(1, 100)
-    return jsonify({"uptime_seconds": uptime, "random_value": random_value}), 200
+    uptime_gauge.set(time.time() - start_time)
+    # random_gauge.set(...)
+    return generate_latest(), 200, {"Content-Type": CONTENT_TYPE_LATEST}
+
+
+# @metrics_bp.route("/metrics/custom")
+# def metrics_custom():
+#     uptime = time.time() - start_time
+#     random_value = random.randint(1, 100)
+#     return jsonify({"uptime_seconds": uptime, "random_value": random_value}), 200