openapi: 3.1.0
info:
  title: Amazon CloudWatch Alarms API
  description: Amazon CloudWatch monitors your Amazon Web Services resources and the applications you run on AWS in real time. You can use CloudWatch to collect and track metrics, create alarms that send notifications, and automatically react to changes in your AWS resources. CloudWatch provides a reliable, scalable, and flexible monitoring solution for your cloud infrastructure.
  version: '2010-08-01'
  contact:
    name: Amazon Web Services
    url: https://aws.amazon.com/contact-us/
  termsOfService: https://aws.amazon.com/service-terms/
servers:
- url: https://monitoring.{region}.amazonaws.com
  description: Amazon CloudWatch Regional Endpoint
  variables:
    region:
      default: us-east-1
      description: AWS Region
security:
- sigv4Auth: []
tags:
- name: Alarms
  description: Operations for creating, describing, and deleting metric alarms
paths:
  /?Action=PutMetricAlarm:
    get:
      operationId: putMetricAlarm
      summary: Amazon CloudWatch Create or update a metric alarm
      description: Creates or updates an alarm and associates it with the specified metric, metric math expression, anomaly detection model, or Metrics Insights query. When the alarm state changes, the action specified is performed.
      tags:
      - Alarms
      parameters:
      - name: AlarmName
        in: query
        required: true
        description: The name for the alarm
        schema:
          type: string
          minLength: 1
          maxLength: 255
      - name: AlarmDescription
        in: query
        description: A description for the alarm
        schema:
          type: string
          maxLength: 1024
      - name: Namespace
        in: query
        description: The namespace for the metric associated with the alarm
        schema:
          type: string
      - name: MetricName
        in: query
        description: The name for the metric associated with the alarm
        schema:
          type: string
      - name: Statistic
        in: query
        description: The statistic for the metric associated with the alarm
        schema:
          type: string
          enum:
          - SampleCount
          - Average
          - Sum
          - Minimum
          - Maximum
      - name: Period
        in: query
        description: The length in seconds of the evaluation period
        schema:
          type: integer
          minimum: 10
      - name: EvaluationPeriods
        in: query
        required: true
        description: The number of periods over which data is compared to the threshold
        schema:
          type: integer
          minimum: 1
      - name: Threshold
        in: query
        description: The value to compare with the specified statistic
        schema:
          type: number
      - name: ComparisonOperator
        in: query
        required: true
        description: The arithmetic operation to use when comparing the statistic and threshold
        schema:
          type: string
          enum:
          - GreaterThanOrEqualToThreshold
          - GreaterThanThreshold
          - LessThanThreshold
          - LessThanOrEqualToThreshold
          - LessThanLowerOrGreaterThanUpperThreshold
          - LessThanLowerThreshold
          - GreaterThanUpperThreshold
      - name: ActionsEnabled
        in: query
        description: Whether actions should be executed during alarm state changes
        schema:
          type: boolean
      - name: AlarmActions.member.1
        in: query
        description: The ARN of the action to execute when the alarm transitions to ALARM state
        schema:
          type: string
      - name: OKActions.member.1
        in: query
        description: The ARN of the action to execute when the alarm transitions to OK state
        schema:
          type: string
      - name: InsufficientDataActions.member.1
        in: query
        description: The ARN of the action to execute when the alarm transitions to INSUFFICIENT_DATA state
        schema:
          type: string
      - name: Dimensions.member.1.Name
        in: query
        description: The name of the dimension
        schema:
          type: string
      - name: Dimensions.member.1.Value
        in: query
        description: The value of the dimension
        schema:
          type: string
      - name: TreatMissingData
        in: query
        description: How to treat missing data when evaluating the alarm
        schema:
          type: string
          enum:
          - breaching
          - notBreaching
          - ignore
          - missing
      responses:
        '200':
          description: Successfully created or updated alarm
        '400':
          description: Invalid request parameters
        '401':
          description: Authentication failure
        '403':
          description: Authorization failure
  /?Action=DescribeAlarms:
    get:
      operationId: describeAlarms
      summary: Amazon CloudWatch Describe metric alarms
      description: Retrieves the specified alarms. You can filter the results by specifying a prefix for the alarm name, the alarm state, or a prefix for any action.
      tags:
      - Alarms
      parameters:
      - name: AlarmNames.member.1
        in: query
        description: The name of the alarm to retrieve
        schema:
          type: string
      - name: AlarmNamePrefix
        in: query
        description: An alarm name prefix to filter by
        schema:
          type: string
      - name: StateValue
        in: query
        description: Filter by alarm state
        schema:
          type: string
          enum:
          - OK
          - ALARM
          - INSUFFICIENT_DATA
      - name: ActionPrefix
        in: query
        description: An action name prefix to filter by
        schema:
          type: string
      - name: MaxRecords
        in: query
        description: The maximum number of alarm descriptions to retrieve
        schema:
          type: integer
          minimum: 1
          maximum: 100
      - name: NextToken
        in: query
        description: Token for the next page of results
        schema:
          type: string
      responses:
        '200':
          description: Successfully described alarms
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/DescribeAlarmsResponse'
        '400':
          description: Invalid request parameters
        '401':
          description: Authentication failure
  /?Action=DeleteAlarms:
    get:
      operationId: deleteAlarms
      summary: Amazon CloudWatch Delete metric alarms
      description: Deletes the specified alarms. You can delete up to 100 alarms in one operation. In the event of an error, no alarms are deleted.
      tags:
      - Alarms
      parameters:
      - name: AlarmNames.member.1
        in: query
        required: true
        description: The name of the alarm to delete
        schema:
          type: string
      - name: AlarmNames.member.2
        in: query
        description: Additional alarm name to delete
        schema:
          type: string
      - name: AlarmNames.member.3
        in: query
        description: Additional alarm name to delete
        schema:
          type: string
      responses:
        '200':
          description: Successfully deleted alarms
        '400':
          description: Invalid request parameters
        '401':
          description: Authentication failure
components:
  schemas:
    DescribeAlarmsResponse:
      type: object
      description: Response from the DescribeAlarms action
      properties:
        metricAlarms:
          type: array
          description: The information about the alarms
          items:
            $ref: '#/components/schemas/Alarm'
        nextToken:
          type: string
          description: Token for the next page of results
    Alarm:
      type: object
      description: Represents a CloudWatch metric alarm
      properties:
        alarmName:
          type: string
          description: The name of the alarm
        alarmArn:
          type: string
          description: The ARN of the alarm
        alarmDescription:
          type: string
          description: The description of the alarm
        stateValue:
          type: string
          description: The state value for the alarm
          enum:
          - OK
          - ALARM
          - INSUFFICIENT_DATA
        stateReason:
          type: string
          description: An explanation for the alarm state
        stateUpdatedTimestamp:
          type: string
          format: date-time
          description: The time stamp of the last update to the state
        metricName:
          type: string
          description: The name of the metric associated with the alarm
        namespace:
          type: string
          description: The namespace of the metric associated with the alarm
        statistic:
          type: string
          description: The statistic for the metric associated with the alarm
        dimensions:
          type: array
          description: The dimensions for the metric associated with the alarm
          items:
            type: object
            properties:
              name:
                type: string
              value:
                type: string
        period:
          type: integer
          description: The period in seconds over which the statistic is applied
        evaluationPeriods:
          type: integer
          description: The number of periods over which data is compared to the threshold
        threshold:
          type: number
          description: The value to compare with the specified statistic
        comparisonOperator:
          type: string
          description: The arithmetic operation to use when comparing the statistic and threshold
        treatMissingData:
          type: string
          description: How missing data points are treated
        actionsEnabled:
          type: boolean
          description: Whether actions are executed during alarm state changes
        alarmActions:
          type: array
          description: The actions to execute when the alarm transitions to ALARM state
          items:
            type: string
        okActions:
          type: array
          description: The actions to execute when the alarm transitions to OK state
          items:
            type: string
        insufficientDataActions:
          type: array
          description: The actions to execute when the alarm transitions to INSUFFICIENT_DATA state
          items:
            type: string
  securitySchemes:
    sigv4Auth:
      type: apiKey
      name: Authorization
      in: header
      description: AWS Signature Version 4 authentication
externalDocs:
  description: Amazon CloudWatch API Reference
  url: https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/