constructor()

in src/constructs/cloudwatch/api-gateway-alarms.ts [21:44]

• 24 lines of code
• 2 McCabe index (conditional complexity)

  constructor(scope: GuStack, props: GuApiGateway5xxPercentageAlarmProps) {
    const mathExpression = new MathExpression({
      expression: "100*m1/m2",
      usingMetrics: {
        m1: props.apiGatewayInstance.metricServerError(),
        m2: props.apiGatewayInstance.metricCount(),
      },
      label: `% of 5XX responses served for ${props.app}`,
      period: Duration.minutes(1),
    });
    const defaultAlarmName = `High 5XX error percentage from ${props.app} (ApiGateway) in ${scope.stage}`;
    const defaultDescription = `${props.app} exceeded ${props.tolerated5xxPercentage}% error rate`;
    const alarmProps = {
      ...props,
      metric: mathExpression,
      treatMissingData: TreatMissingData.NOT_BREACHING,
      threshold: props.tolerated5xxPercentage,
      comparisonOperator: ComparisonOperator.GREATER_THAN_THRESHOLD,
      alarmName: props.alarmName ?? defaultAlarmName,
      alarmDescription: props.alarmDescription ?? defaultDescription,
      evaluationPeriods: props.numberOfMinutesAboveThresholdBeforeAlarm ?? 1,
    };
    super(scope, AppIdentity.suffixText(props, "ApiGatewayHigh5xxPercentageAlarm"), alarmProps);
  }