add an example config file and make target for starting a prometheus

tools/prometheus/.gitignore

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+./data

tools/prometheus/prometheus.yml

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+# prometheus.yml
+# my global config
+global:
+  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
+  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
+    # scrape_timeout is set to the global default (10s).
+
+# Alertmanager configuration
+alerting:
+  alertmanagers:
+  - static_configs:
+    - targets:
+        # - alertmanager:9093
+
+# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+rule_files:
+    # - "first_rules.yml"
+    # - "second_rules.yml"
+
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
+  - job_name: 'prometheus'
+      # metrics_path defaults to '/metrics'
+      # scheme defaults to 'http'.
+    static_configs:
+    - targets: ['127.0.0.1:9090']
+
+  - job_name: 'awx'
+    tls_config:
+      insecure_skip_verify: True
+    metrics_path: /api/v2/metrics
+    scrape_interval: 5s
+    scheme: http
+    params:
+      format: ['txt']
+    basic_auth:
+      username: admin
+      password: password
+    # bearer_token: oauth-token
+    static_configs:
+      - targets:
+        - awxweb:8013