AWSTemplateFormatVersion: '2010-09-09'
Description: Deploy a Master-Slave CloudWatch dashboard.
Parameters:
  MasterInstanceId:
      Description: Optional identifier for the Gerrit master instance
      Default: gerrit-master-slave-MASTER
      Type: String
  SlaveInstanceId:
      Description: Optional identifier for the Gerrit slave instance
      Default: gerrit-master-slave-SLAVE
      Type: String
  MetricsCloudwatchNamespace:
      Description: The CloudWatch namespace for Gerrit metrics
      Type: String
      Default: gerrit
Resources:
  CloudWatchDashboard:
      Type: AWS::CloudWatch::Dashboard
      Properties:
          DashboardName: !Ref AWS::StackName
          DashboardBody: !Sub |
                {
                    "start": "-PT6H",
                    "periodOverride": "auto",
                    "widgets": [
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 0,
                            "width": 24,
                            "height": 3,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "sshd/sessions/connected", "InstanceId", "${MasterInstanceId}", "Type", "gauge" ],
                                    [ "${MetricsCloudwatchNamespace}", "sshd/sessions/connected", "InstanceId", "${SlaveInstanceId}", "Type", "gauge" ]
                                ],
                                "view": "singleValue",
                                "region": "${AWS::Region}",
                                "stat": "Maximum",
                                "period": 60,
                                "title": "SSH Connection",
                                "stacked": false
                            }
                        },
                        {
                            "type": "metric",
                            "x": 6,
                            "y": 3,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ { "expression": "RATE(METRICS())", "label": "Expression1", "id": "e1", "region": "${AWS::Region}" } ],
                                    [ "${MetricsCloudwatchNamespace}", "proc/cpu/usage", "InstanceId", "${MasterInstanceId}", "Type", "gauge", { "id": "m1", "visible": false } ],
                                    [ "${MetricsCloudwatchNamespace}", "proc/cpu/usage", "InstanceId", "${SlaveInstanceId}", "Type", "gauge", { "id": "m2", "visible": false } ]
                                ],
                                "view": "timeSeries",
                                "stacked": false,
                                "region": "${AWS::Region}",
                                "stat": "Average",
                                "period": 60,
                                "title": "Gerrit Cpu Load",
                                "yAxis": {
                                    "right": {
                                        "showUnits": true
                                    },
                                    "left": {
                                        "showUnits": false,
                                        "min": 0
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 12,
                            "y": 33,
                            "width": 12,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "jgit/block_cache/cache_used", "InstanceId", "${MasterInstanceId}", "Type", "gauge", { "id": "m1" } ],
                                    [ "${MetricsCloudwatchNamespace}", "jgit/block_cache/cache_used", "InstanceId", "${SlaveInstanceId}", "Type", "gauge", { "id": "m2" } ]
                                ],
                                "view": "timeSeries",
                                "stacked": false,
                                "region": "${AWS::Region}",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "label": ""
                                    }
                                },
                                "title": "JGit Cache",
                                "period": 60,
                                "stat": "Average"
                            }
                        },
                        {
                            "type": "metric",
                            "x": 18,
                            "y": 3,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "jvm.memory.total.used", "InstanceId", "${MasterInstanceId}", "Type", "gauge" ],
                                    [ "${MetricsCloudwatchNamespace}", "jvm.memory.total.used", "InstanceId", "${SlaveInstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": false,
                                "region": "${AWS::Region}",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                },
                                "stat": "Average",
                                "period": 60,
                                "title": "Gerrit Used memory"
                            }
                        },
                        {
                            "type": "metric",
                            "x": 12,
                            "y": 3,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "proc/cpu/system_load", "InstanceId", "${MasterInstanceId}", "Type", "gauge" ],
                                    [ "${MetricsCloudwatchNamespace}", "proc/cpu/system_load", "InstanceId", "${SlaveInstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": false,
                                "title": "Gerrit System Load",
                                "region": "${AWS::Region}",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                },
                                "stat": "Average",
                                "period": 60
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 9,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "jvm.gc.G1-Old-Generation.time",  "InstanceId", "${MasterInstanceId}", "Type", "gauge" ],
                                    [ "${MetricsCloudwatchNamespace}", "jvm.gc.G1-Old-Generation.time",  "InstanceId", "${SlaveInstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": false,
                                "title": "GC Time",
                                "region": "${AWS::Region}",
                                "stat": "Average",
                                "period": 60,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 6,
                            "y": 9,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "proc/jvm/thread/num_live",  "InstanceId", "${MasterInstanceId}", "Type", "gauge" ],
                                    [ "${MetricsCloudwatchNamespace}", "proc/jvm/thread/num_live",  "InstanceId", "${SlaveInstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": false,
                                "title": "Active Threads",
                                "region": "${AWS::Region}",
                                "period": 60,
                                "stat": "Average",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 15,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "http/server/rest_api/server_latency_total", "InstanceId", "${MasterInstanceId}", "Type", "99.9%", { "id": "m2" } ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "region": "${AWS::Region}",
                                "stat": "Average",
                                "period": 60,
                                "title": "HTTP requests latency",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "label": "ms"
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 6,
                            "y": 15,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ { "expression": "m1+m2", "label": "HTTP hits per second", "id": "e2", "region": "${AWS::Region}" } ],
                                    [ "${MetricsCloudwatchNamespace}", "http/server/success_count_total", "InstanceId", "${MasterInstanceId}", "Type", "count", { "id": "m2", "visible": false } ],
                                    [ ".", "http/server/error_count_total", ".", ".", ".", ".", { "id": "m1", "visible": false } ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "title": "HTTP hits per second",
                                "region": "${AWS::Region}",
                                "stat": "Sum",
                                "period": 60,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "label": "ops",
                                        "min": 0
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 12,
                            "y": 15,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ { "expression": "(m1/(m1+m2))*100", "label": "% of HTTP Errors", "id": "e1", "region": "${AWS::Region}" } ],
                                    [ "${MetricsCloudwatchNamespace}", "http/server/error_count_total", "InstanceId", "${MasterInstanceId}", "Type", "count", { "id": "m1", "visible": false } ],
                                    [ ".", "http/server/success_count_total", ".", ".", ".", ".", { "id": "m2", "visible": false } ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "region": "${AWS::Region}",
                                "stat": "Sum",
                                "period": 60,
                                "title": "% of HTTP Errors",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "max": 100,
                                        "min": 0
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 12,
                            "y": 9,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "git/upload-pack/request_count_total", "InstanceId", "${MasterInstanceId}", "Type", "count", { "id": "m1" } ],
                                    [ "${MetricsCloudwatchNamespace}", "git/upload-pack/request_count_total", "InstanceId", "${SlaveInstanceId}", "Type", "count", { "id": "m1" } ]
                                ],
                                "view": "timeSeries",
                                "stacked": false,
                                "region": "${AWS::Region}",
                                "title": "Git upload pack - count",
                                "stat": "Sum",
                                "period": 60,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "min": 0
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 21,
                            "width": 24,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ { "expression": "RATE(METRICS())*PERIOD(m1)", "label": "Expression1", "id": "e1" } ],
                                    [ "${MetricsCloudwatchNamespace}", "queue/index_batch/total_scheduled_tasks_count", "InstanceId", "${MasterInstanceId}", "Type", "gauge", { "id": "m1", "visible": false } ],
                                    [ ".", "queue/receive_commits/total_scheduled_tasks_count", ".", ".", ".", ".", { "id": "m2", "visible": false } ],
                                    [ ".", "queue/work_queue/total_scheduled_tasks_count", ".", ".", ".", ".", { "id": "m3", "visible": false } ],
                                    [ ".", "queue/ssh_command_start/total_scheduled_tasks_count", ".", ".", ".", ".", { "id": "m4", "visible": false } ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "title": "Scheduled Tasks Queues",
                                "region": "${AWS::Region}",
                                "stat": "Sum",
                                "period": 60,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "min": 0
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 27,
                            "width": 24,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "queue/send_email/scheduled_tasks", "InstanceId", "${MasterInstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "region": "${AWS::Region}",
                                "title": "Scheduled email tasks in the queue",
                                "stat": "Sum",
                                "period": 300,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 33,
                            "width": 12,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "jgit/block_cache/open_files", "InstanceId", "${MasterInstanceId}", "Type", "gauge" ],
                                    [ "${MetricsCloudwatchNamespace}", "jgit/block_cache/open_files", "InstanceId", "${SlaveInstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": false,
                                "title": "Pack files cached",
                                "region": "${AWS::Region}",
                                "stat": "Sum",
                                "period": 60,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 3,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "AWS/EC2", "CPUUtilization" ]
                                ],
                                "view": "timeSeries",
                                "stacked": false,
                                "region": "${AWS::Region}",
                                "title": "Cluster CPU Load",
                                "period": 60,
                                "stat": "Average"
                            }
                        }
                    ]
                }