---
AWSTemplateFormatVersion: 2010-09-09

Description: Reference Architecture to host WordPress on AWS - Creates CloudWatch Dashboard

Metadata:

  Authors:
    Description: Darryl Osborne (darrylo@amazon.com)
  License:
    Description: 'Copyright 2018 Amazon.com, Inc. and its affiliates. All Rights Reserved.
                  SPDX-License-Identifier: MIT-0'

  AWS::CloudFormation::Interface:
    ParameterGroups:
    - Label:
        default: AWS Resource Parameters
      Parameters:
        - ElasticFileSystem
        - DatabaseCluster
        - PublicAlbFullName
        - EfsCreateAlarms
        - BurstCreditBalanceDecreaseAlarmArn
        - BurstCreditBalanceIncreaseAlarmArn
        - CriticalAlarmArn
        - WarningAlarmArn
    ParameterLabels:
      BurstCreditBalanceDecreaseAlarmArn:
        default: Decrease Alarm Arn
      BurstCreditBalanceIncreaseAlarmArn:
        default: Increase Alarm Arn
      CriticalAlarmArn:
        default: Critical Alarm Arn
      DatabaseCluster:
        default: Amazon RDS Database Cluster
      ElasticFileSystem:
        default: Amazon EFS File System
      EfsCreateAlarms:
        default: EFS Alarms Created
      PublicAlbFullName:
        default: Amazon ALB Full Name
      WarningAlarmArn:
        default: Warning Alarm Arn

Parameters:

  BurstCreditBalanceDecreaseAlarmArn:
    Default: ''
    Description: Amazon EFS Burst Credit Balance Decrease Alarm Arn
    Type: String
  BurstCreditBalanceIncreaseAlarmArn:
    Default: ''
    Description: Amazon EFS Burst Credit Balance Increase Alarm Arn
    Type: String
  CriticalAlarmArn:
    Default: ''
    Description: Amazon EFS Burst Credit Balance Critical Alarm Arn
    Type: String
  DatabaseCluster:
    Description: Amazon RDS database cluster
    Type: String
  EfsCreateAlarms:
    AllowedValues:
      - true
      - false
    Description: Were Amazon EFS alarms created?
    Type: String
  ElasticFileSystem:
    Description: Amazon EFS file system id.
    Type: String
  PublicAlbFullName:
    Description: Amazon ALB Full Name
    Type: String
  WarningAlarmArn:
    Default: ''
    Description: Amazon EFS Burst Credit Balance Warning Alarm Arn
    Type: String

Conditions:

  Alarms:
    !Equals [ !Ref EfsCreateAlarms, true ]
  NoAlarms:
    !Equals [ !Ref EfsCreateAlarms, false ]

Resources:

  DashboardWithAlarms:
    Condition: Alarms
    Type: AWS::CloudWatch::Dashboard
    Properties:
      DashboardName: !Join [ '_', [ !Ref 'AWS::Region', !Ref 'AWS::StackName' ] ]
      DashboardBody:
        {"Fn::Join":
          [ "",
          [ 
            '{"widgets": [
                  {
                      "type": "metric",
                      "x": 0,
                      "y": 0,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/EFS", "TotalIOBytes", "FileSystemId", "',!Ref 'ElasticFileSystem','", { "stat": "Sum", "period": 60 } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "EFS Throughput"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 18,
                      "y": 0,
                      "width": 6,
                      "height": 3,
                      "properties": {
                          "view": "singleValue",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/EFS", "PermittedThroughput", "FileSystemId", "',!Ref 'ElasticFileSystem','", { "stat": "Maximum" } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "EFS PermittedThroughput"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 6,
                      "y": 0,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/EFS", "TotalIOBytes", "FileSystemId", "',!Ref 'ElasticFileSystem','", { "stat": "SampleCount", "period": 60 } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "EFS IOPS"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 12,
                      "y": 0,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/EFS", "BurstCreditBalance", "FileSystemId", "',!Ref 'ElasticFileSystem','", { "stat": "Maximum", "period": 60 } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "EFS BurstCreditBalance"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 18,
                      "y": 3,
                      "width": 6,
                      "height": 3,
                      "properties": {
                          "view": "singleValue",
                          "metrics": [
                              [ "Custom/EFS", "SizeInBytes", "FileSystemId", "',!Ref 'ElasticFileSystem','" ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "EFS SizeInBytes"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 0,
                      "y": 12,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/ApplicationELB", "RequestCount", "LoadBalancer", "',!Ref 'PublicAlbFullName','", { "stat": "Sum", "period": 60 } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "ALB RequestCount"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 6,
                      "y": 12,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/ApplicationELB", "ActiveConnectionCount", "LoadBalancer", "',!Ref 'PublicAlbFullName','", { "stat": "Sum", "period": 60 } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "ALB ActiveConnectionCount"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 12,
                      "y": 12,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/RDS", "FreeableMemory", "Role", "READER", "DBClusterIdentifier", "',!Ref 'DatabaseCluster','", { "stat": "Sum", "period": 60 } ],
                              [ "...", "WRITER", ".", ".", { "period": 60, "stat": "Sum" } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "RDS FreeableMemory"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 18,
                      "y": 12,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/RDS", "CPUUtilization", "Role", "READER", "DBClusterIdentifier", "',!Ref 'DatabaseCluster','", { "stat": "Sum", "period": 60 } ],
                              [ "...", "WRITER", ".", ".", { "period": 60, "stat": "Sum" } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "RDS CPUUtilization"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 0,
                      "y": 6,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "title": "EFS Burst Credit Balance Increase Threshold",
                          "annotations": {
                              "alarms": [
                                  "',!Ref 'BurstCreditBalanceIncreaseAlarmArn','"
                              ]
                          },
                          "view": "timeSeries",
                          "stacked": false
                      }
                  },
                  {
                      "type": "metric",
                      "x": 6,
                      "y": 6,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "title": "EFS Burst Credit Balance Decrease Threshold",
                          "annotations": {
                              "alarms": [
                                  "',!Ref 'BurstCreditBalanceDecreaseAlarmArn','"
                              ]
                          },
                          "view": "timeSeries",
                          "stacked": false
                      }
                  },
                  {
                      "type": "metric",
                      "x": 12,
                      "y": 6,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "title": "EFS Burst Credit Balance - Warning",
                          "annotations": {
                              "alarms": [
                                  "',!Ref 'WarningAlarmArn','"
                              ]
                          },
                          "view": "timeSeries",
                          "stacked": false
                      }
                  },
                  {
                      "type": "metric",
                      "x": 18,
                      "y": 6,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "title": "EFS Burst Credit Balance - Critical",
                          "annotations": {
                              "alarms": [
                                  "',!Ref 'CriticalAlarmArn','"
                              ]
                          },
                          "view": "timeSeries",
                          "stacked": false
                      }
                  }
              ]
            }'
          ]
          ]
        }
  DashboardWithNoAlarms:
    Condition: NoAlarms
    Type: AWS::CloudWatch::Dashboard
    Properties:
      DashboardName: !Join [ '_', [ !Ref 'AWS::Region', !Ref 'AWS::StackName' ] ]
      DashboardBody:
        {"Fn::Join":
          [ "",
          [ 
            '{"widgets": [
                  {
                      "type": "metric",
                      "x": 0,
                      "y": 0,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/EFS", "TotalIOBytes", "FileSystemId", "',!Ref 'ElasticFileSystem','", { "stat": "Sum", "period": 60 } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "EFS Throughput"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 18,
                      "y": 0,
                      "width": 6,
                      "height": 3,
                      "properties": {
                          "view": "singleValue",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/EFS", "PermittedThroughput", "FileSystemId", "',!Ref 'ElasticFileSystem','", { "stat": "Maximum" } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "EFS PermittedThroughput"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 6,
                      "y": 0,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/EFS", "TotalIOBytes", "FileSystemId", "',!Ref 'ElasticFileSystem','", { "stat": "SampleCount", "period": 60 } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "EFS IOPS"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 12,
                      "y": 0,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/EFS", "BurstCreditBalance", "FileSystemId", "',!Ref 'ElasticFileSystem','", { "stat": "Maximum", "period": 60 } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "EFS BurstCreditBalance"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 18,
                      "y": 3,
                      "width": 6,
                      "height": 3,
                      "properties": {
                          "view": "singleValue",
                          "metrics": [
                              [ "Custom/EFS", "SizeInBytes", "FileSystemId", "',!Ref 'ElasticFileSystem','" ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "EFS SizeInBytes"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 0,
                      "y": 12,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/ApplicationELB", "RequestCount", "LoadBalancer", "',!Ref 'PublicAlbFullName','", { "stat": "Sum", "period": 60 } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "ALB RequestCount"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 6,
                      "y": 12,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/ApplicationELB", "ActiveConnectionCount", "LoadBalancer", "',!Ref 'PublicAlbFullName','", { "stat": "Sum", "period": 60 } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "ALB ActiveConnectionCount"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 12,
                      "y": 12,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/RDS", "FreeableMemory", "Role", "READER", "DBClusterIdentifier", "',!Ref 'DatabaseCluster','", { "stat": "Sum", "period": 60 } ],
                              [ "...", "WRITER", ".", ".", { "period": 60, "stat": "Sum" } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "RDS FreeableMemory"
                      }
                  },
                  {
                      "type": "metric",
                      "x": 18,
                      "y": 12,
                      "width": 6,
                      "height": 6,
                      "properties": {
                          "view": "timeSeries",
                          "stacked": false,
                          "metrics": [
                              [ "AWS/RDS", "CPUUtilization", "Role", "READER", "DBClusterIdentifier", "',!Ref 'DatabaseCluster','", { "stat": "Sum", "period": 60 } ],
                              [ "...", "WRITER", ".", ".", { "period": 60, "stat": "Sum" } ]
                          ],
                          "region": "',!Ref 'AWS::Region','",
                          "title": "RDS CPUUtilization"
                      }
                  }
              ]
            }'
          ]
          ]
        }