# 
# This sample adds Amazon CloudWatch alarms to the AWS Elastic Beanstalk Elastic RDS database.
#
# To configure the Alarm, you should create a separate configuration file that contains
# an option-settings section such as the following (all properties are showing the default values).
#
# option_settings:
#   "aws:elasticbeanstalk:customoption":
#     RDSAlarmEmail: "nobody@amazon.com"
#     RDSCPUThresholdPercent: "50"
#     RDSFreeStorage:  "1000000000"
#     RDSReadLatency:  "0.1"
#     RDSWriteLatency: "0.1"
#
##


Resources:
  RDSAlarmTopic:
    Type: AWS::SNS::Topic
    Properties:
      Subscription:
        - Endpoint:
            Fn::GetOptionSetting:
              OptionName: RDSAlarmEmail
              DefaultValue: "nobody@amazon.com"
          Protocol: email

  RDSCPUAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmDescription: { "Fn::Join" : ["", [{ "Ref" : "AWSEBEnvironmentName" }, ": HIGH RDS CPU utilization." ]]}
      Namespace: AWS/RDS
      MetricName: CPUUtilization
      Dimensions:
        - Name: DBInstanceIdentifier
          Value : { "Ref" : "AWSEBRDSDatabase" }
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 
        Fn::GetOptionSetting:
          OptionName: RDSCPUThresholdPercent
          # 50% CPU utilization
          DefaultValue: "50"
      ComparisonOperator: GreaterThanThreshold
      AlarmActions:
        - Ref: RDSAlarmTopic
      InsufficientDataActions:
        - Ref: RDSAlarmTopic

  RDSFreeSpaceAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmDescription: { "Fn::Join" : ["", [{ "Ref" : "AWSEBEnvironmentName" }, ": LOW free storage space." ]]}
      Namespace: AWS/RDS
      MetricName: FreeStorageSpace
      Dimensions:
        - Name: DBInstanceIdentifier
          Value : { "Ref" : "AWSEBRDSDatabase" }
      Statistic: Average
      Period: 300
      EvaluationPeriods: 1
      Threshold: 
        Fn::GetOptionSetting:
          OptionName: RDSFreeStorage
          # Alarm when less than 1G of space is left
          DefaultValue: 1000000000
      ComparisonOperator: LessThanOrEqualToThreshold
      AlarmActions:
        - Ref: RDSAlarmTopic
      InsufficientDataActions:
        - Ref: RDSAlarmTopic

  RDSReadLatencyAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmDescription: { "Fn::Join" : ["", [{ "Ref" : "AWSEBEnvironmentName" }, ": HIGH read latency." ]]}
      Namespace: AWS/RDS
      MetricName: ReadLatency
      Dimensions:
        - Name: DBInstanceIdentifier
          Value : { "Ref" : "AWSEBRDSDatabase" }
      Statistic: Average
      Period: 300
      EvaluationPeriods: 1
      Threshold: 
        Fn::GetOptionSetting:
          OptionName: RDSReadLatency
          # 100ms
          DefaultValue: 0.1
      ComparisonOperator: GreaterThanThreshold
      AlarmActions:
        - Ref: RDSAlarmTopic
      InsufficientDataActions:
        - Ref: RDSAlarmTopic

  RDSWriteLatencyAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmDescription: { "Fn::Join" : ["", [{ "Ref" : "AWSEBEnvironmentName" }, ": HIGH write latency." ]]}
      Namespace: AWS/RDS
      MetricName: WriteLatency
      Dimensions:
        - Name: DBInstanceIdentifier
          Value : { "Ref" : "AWSEBRDSDatabase" }
      Statistic: Average
      Period: 300
      EvaluationPeriods: 1
      Threshold: 
        Fn::GetOptionSetting:
          OptionName: RDSWriteLatency
          # 100ms
          DefaultValue: 0.1
      ComparisonOperator: GreaterThanThreshold
      AlarmActions:
        - Ref: RDSAlarmTopic
      InsufficientDataActions:
        - Ref: RDSAlarmTopic