新增部署Prometheus监控工具脚本；更新README.md文件

prometheus/roles/promtail/templates/conf/promtail-config.yaml.j2

@@ -0,0 +1,24 @@
+server:
+  http_listen_port: 9080
+  grpc_listen_port: 0
+
+positions:
+  filename: /tmp/positions.yaml
+
+clients:
+  - url: http://{{ groups.server.0 }}:{{ loki.port }}/loki/api/v1/push
+
+scrape_configs: 
+{% for node in promtail.nodes -%} 
+{% if node.host == inventory_hostname -%} 
+{% for target in node.targets -%} 
+- job_name: {{ target.name }} 
+  static_configs: 
+  - targets: 
+      - localhost 
+    labels: 
+      job: {{ target.name }} 
+      __path__: {{ target.path }}/*log 
+{% endfor %} 
+{% endif %} 
+{% endfor %}