Grafana dashboard: Tomcat
Description: Tomcat Dashboard (Micrometer.io)

Tomcat dashboard will display the metrics from micrometer. You can setup the application name and the region in your Spring Boot app with the config:

    @Bean
    MeterRegistryCustomizer<MeterRegistry> metricsCommonTags() {
        return registry -> registry.config()
                .commonTags(
                        "application", applicationName,
                        "region", regionName);
    }

The application name and region can be provided in your application.properties or environment variables.

The thread alert threshold is set to 170 threads. The default value for `tomcat_threads_config_max` is 200.

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      "name": "DS_PROMETHEUS",
      "label": "prometheus",
      "description": "",
      "type": "datasource",
      "pluginId": "prometheus",
      "pluginName": "Prometheus"
    }
  ],
  "__requires": [
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      "type": "grafana",
      "id": "grafana",
      "name": "Grafana",
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    },
    {
      "type": "panel",
      "id": "graph",
      "name": "Graph",
      "version": "5.0.0"
    },
    {
      "type": "datasource",
      "id": "prometheus",
      "name": "Prometheus",
      "version": "5.0.0"
    },
    {
      "type": "panel",
      "id": "singlestat",
      "name": "Singlestat",
      "version": "5.0.0"
    }
  ],
  "annotations": {
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      {
        "builtIn": 1,
        "datasource": "-- Grafana --",
        "enable": true,
        "hide": true,
        "iconColor": "rgba(0, 211, 255, 1)",
        "name": "Annotations & Alerts",
        "type": "dashboard"
      },
      {
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        "enable": true,
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        "hide": false,
        "iconColor": "rgba(255, 96, 96, 1)",
        "limit": 100,
        "name": "Restart Detection",
        "showIn": 0,
        "step": "1m",
        "tagKeys": "restart-tag",
        "tags": [],
        "textFormat": "uptime reset",
        "titleFormat": "Restart",
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      }
    ]
  },
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  "editable": true,
  "gnetId": 6090,
  "graphTooltip": 1,
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  "iteration": 1530128800560,
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        "y": 0
      },
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    },
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            },
            "type": "query"
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        ],
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        "noDataState": "no_data",
        "notifications": []
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          "fill": true,
          "line": true,
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        "w": 24,
        "x": 0,
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      },
      "id": 25,
      "panels": [],
      "title": "Servlets",
      "type": "row"
    },
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      "colorValue": false,
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      "thresholds": "",
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      "dashes": false,
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      "fill": 1,
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        "w": 19,
        "x": 5,
        "y": 11
      },
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        "min": false,
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        "values": false
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
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      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
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      "stack": false,
      "steppedLine": false,
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          "legendFormat": "Response time",
          "refId": "A"
        }
      ],
      "thresholds": [],
      "timeFrom": null,
      "timeShift": null,
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      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
      },
      "type": "graph",
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      },
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        {
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          "min": null,
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          "max": null,
          "min": null,
          "show": true
        }
      ],
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      }
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      "colorValue": false,
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      ],
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      },
      "tableColumn": "",
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        {
          "expr": "tomcat_servlet_request_max_seconds{application=\"$application\", region=\"$region\", instance=~\"$instance\"}",
          "format": "time_series",
          "intervalFactor": 1,
          "legendFormat": "",
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      "gridPos": {
        "h": 1,
        "w": 24,
        "x": 0,
        "y": 19
      },
      "id": 12,
      "panels": [],
      "title": "Cache",
      "type": "row"
    },
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "${DS_PROMETHEUS}",
      "fill": 1,
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        "h": 6,
        "w": 24,
        "x": 0,
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      },
      "id": 23,
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        "values": true
      },
      "lines": true,
      "linewidth": 1,
      "links": [],
      "nullPointMode": "null",
      "percentage": false,
      "pointradius": 5,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "expr": "tomcat_cache_access_total{application=\"$application\", region=\"$region\", instance=~\"$instance\"}",
          "format": "time_series",
          "interval": "",
          "intervalFactor": 1,
          "legendFormat": "Cache total",
          "refId": "A"
        },
        {
          "expr": "tomcat_cache_hit_total{application=\"$application\", region=\"$region\", instance=~\"$instance\"}",
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          "intervalFactor": 1,
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        }
      ],
      "thresholds": [],
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      "timeShift": null,
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      },
      "id": 10,
      "panels": [],
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    },
    {
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      "colorValue": false,
      "colors": [
        "#299c46",
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      ],
      "datasource": "${DS_PROMETHEUS}",
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        "thresholdMarkers": true
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      },
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      "prefixFontSize": "50%",
      "rangeMaps": [
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        "lineColor": "rgb(31, 120, 193)",
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      },
      "tableColumn": "",
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        "thresholdLabels": false,
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