新增部署Prometheus监控工具脚本；更新README.md文件

prometheus/roles/loki/defaults/main.yml

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+---
+flag: ~/.flag/{{ role_name }}

prometheus/roles/loki/tasks/main.yml

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+---
+# 校验 Loki 是否安装
+- name: '<{{ cmd | upper }}> | 校验 Loki 是否安装'
+  stat:
+    path: '{{ flag }}'
+  register: ret
+
+# 安装 Loki
+- block: 
+  - name: '<{{ cmd | upper }}> | 创建 Loki 相关目录'
+    file:
+      path: '{{ item.value }}'
+      state: directory
+    loop: '{{ loki.dir | dict2items }}'
+
+  - name: '<{{ cmd | upper }}> | 安装 Loki'
+    template: 
+      src: '{{ item.src }}'
+      dest: '{{ item.dest }}'
+    loop:
+    - src: docker-compose.yml.j2
+      dest: '{{ loki.dir.main }}/docker-compose.yml'
+    - src: conf/loki-config.yaml.j2
+      dest: '{{ loki.dir.conf }}/loki-config.yaml'
+
+  - name: '<{{ cmd | upper }}> | 启动 Loki 容器'
+    shell: |
+      . /etc/profile
+      chown -R 10001.10001 {{ loki.dir.conf }}
+      cd {{ loki.dir.main }}
+      docker-compose down
+      docker-compose up -d
+
+  - name: '<{{ cmd | upper }}> | 等待 Loki 服务启动'
+    wait_for:
+      port: '{{ loki.port }}'
+
+  - name: '<{{ cmd | upper }}> | 创建 Loki 安装标记'
+    shell: |
+      set -ex
+      mkdir -p ~/.flag
+      touch {{ flag }}
+
+  when:
+  - cmd == "install"
+  - not ret.stat.exists
+  - loki.enable
+
+# 卸载 Loki
+- block:
+  - name: '<{{ cmd | upper }}> | 卸载 Loki'
+    shell: |
+      . /etc/profile
+      cd {{ loki.dir.main }}
+      docker-compose down
+
+  - name: '<{{ cmd | upper }}> | 清除 Loki 相关文件'
+    shell: |
+      rm -rf {{ loki.dir.main }}
+      rm -rf {{ flag }}
+
+  when:
+  - cmd == "remove"
+  - ret.stat.exists
+  - loki.enable

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

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+auth_enabled: false
+
+server:
+  http_listen_port: 3100
+  grpc_listen_port: 9096
+
+common:
+  path_prefix: /tmp/loki
+  storage:
+    filesystem:
+      chunks_directory: /tmp/loki/chunks
+      rules_directory: /tmp/loki/rules
+  replication_factor: 1
+  ring:
+    instance_addr: 127.0.0.1
+    kvstore:
+      store: inmemory
+
+schema_config:
+  configs:
+    - from: 2020-10-24
+      store: boltdb-shipper
+      object_store: filesystem
+      schema: v11
+      index:
+        prefix: index_
+        period: 24h
+
+ruler:
+  alertmanager_url: http://{{ groups.server.0 }}:{{ alertmanager.port }}

prometheus/roles/loki/templates/docker-compose.yml.j2

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+version: "3.9"
+
+services:
+  loki:
+    image: {{ loki.image }}
+    container_name: {{ docker.network.name }}-loki
+    hostname: loki
+    restart: always
+    volumes:
+      - /etc/localtime:/etc/localtime:ro
+      - {{ loki.dir.conf }}/loki-config.yaml:/etc/loki/loki-config.yaml
+    networks:
+      - {{ docker.network.name }} 
+    ports:
+      - {{ loki.port }}:3100
+    command: "-config.file=/etc/loki/loki-config.yaml"
+
+networks:
+  {{ docker.network.name }}:
+    external: true
+    name: {{ docker.network.name }}