Prometheus example configuration

Assuming that MongoosePush was started with the following command:

    MIX_ENV=integration mix do test.env.up

You can start Prometheus configured to monitor MongoosePush in container
executing the command below:

    docker-compose -f test/docker/docker-compose.prometheus.yml up -d

test/docker/docker-compose.prometheus.yml

@@ -0,0 +1,12 @@
+# This file needs to be used along with `docker-compose.mocks.yml` and `docker-compose.mpush.yml:
+# docker-compose -f test/docker/docker-compose.mocks.yml -f test/docker/docker-compose.mpush.yml -f test/docker/docker-compose.prometheus.yml ...
+version: '3'
+
+services:
+  prometheus:
+    image: prom/prometheus
+    container_name: mongoose-push-prometheus
+    ports:
+      - "9090:9090"
+    volumes:
+      - ./prometheus.yml:/etc/prometheus/prometheus.yml

test/docker/prometheus.yml

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+scrape_configs:
+  - job_name: 'mongoose-push'
+    scheme: 'https' #MongoosePush exposes encrypted endpoint - HTTPS
+    tls_config: #The default certs used by MongoosePush are self-signed
+      insecure_skip_verify: true #For checking purposes we can ignore certs verification
+    static_configs:
+      - targets: ['mongoose-push:8443']
+        labels:
+          group: 'production'