1、修改配置
修改grafana配置文件default.ini，然后重启grafana服务，我这里做了系统服务grafana-server（参考：https://www.cnblogs.com/sunnytomorrow/p/16068405.html）
]# systemctl restart grafana-server ]# systemctl status grafana-server
2、配置邮件发送
访问grafana页面，配置并测试邮件发送，最后点击save进行保存
查看邮箱，邮件示例如下
3、对监控项添加告警指标
模板的部分数据，不支持添加告警指标，可通过自定义dashboard的方式进行配置，此处以docker的相关监控项制定指标，仪表盘json文件如下
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"singlestat", "valueFontSize": "80%", "valueMaps": [ { "op": "=", "text": "N/A", "value": "null" } ], "valueName": "avg" }, { "cacheTimeout": null, "colorBackground": false, "colorValue": false, "colors": [ "rgba(245, 54, 54, 0.9)", "rgba(237, 129, 40, 0.89)", "rgba(50, 172, 45, 0.97)" ], "datasource": "${DS_PROMETHEUS}", "editable": true, "error": false, "format": "mbytes", "gauge": { "maxValue": 100, "minValue": 0, "show": false, "thresholdLabels": false, "thresholdMarkers": true }, "height": "20", "id": 5, "interval": null, "isNew": true, "links": [], "mappingType": 1, "mappingTypes": [ { "name": "value to text", "value": 1 }, { "name": "range to text", "value": 2 } ], "maxDataPoints": 100, "nullPointMode": "connected", "nullText": null, "postfix": "", "postfixFontSize": "50%", "prefix": "", "prefixFontSize": "50%", "rangeMaps": [ { "from": "null", "text": "N/A", "to": "null" } ], "span": 4, "sparkline": { "fillColor": "rgba(31, 118, 189, 0.18)", "full": false, "lineColor": "rgb(31, 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"maxDataPoints": 100, "nullPointMode": "connected", "nullText": null, "postfix": "", "postfixFontSize": "50%", "prefix": "", "prefixFontSize": "50%", "rangeMaps": [ { "from": "null", "text": "N/A", "to": "null" } ], "span": 4, "sparkline": { "fillColor": "rgba(31, 118, 189, 0.18)", "full": false, "lineColor": "rgb(31, 120, 193)", "show": false }, "targets": [ { "expr": "sum(rate(container_cpu_user_seconds_total{image!=\"\"}[5m]) * 100)", "intervalFactor": 2, "legendFormat": "", "metric": "container_memory_usage_bytes", "refId": "A", "step": 240 } ], "thresholds": "", "title": "Total CPU Usage", "transparent": true, "type": "singlestat", "valueFontSize": "80%", "valueMaps": [ { "op": "=", "text": "N/A", "value": "null" } ], "valueName": "current" } ], "title": "New row" }, { "collapse": false, "editable": true, "height": "250px", "panels": [ { "aliasColors": {}, "bars": false, "datasource": "${DS_PROMETHEUS}", "decimals": 2, "editable": true, "error": false, "fill": 1, "grid": { 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按照图中配置完相关参数之后，点击右上角的save按钮进行保存，然后返回到仪表盘的首页面，可看到监控项名称旁多了一个小❤️，如下图
也可以在alert里面对监控指标进行管理，如下图
至此，grafana对监控项配置邮件告警就完成了。