Create RDS instance and send to CloudWatch

    public async Task<string> FunctionHandler(string input, ILambdaContext context)
    {
        // Configure the AWS region and credentials
        var region = RegionEndpoint.USEast1;
        var credentials = new Amazon.Runtime.BasicAWSCredentials("yoursecretkey", "yoursecrettoken");

        // Create an RDS client with the configured region and credentials
        var rdsClient = new AmazonRDSClient(credentials, region);

        // Configure the parameters for the RDS instance
        var dbInstanceIdentifier = "my-rds-instance";
        var dbInstanceClass = "db.t3.small";
        var engine = "sqlserver-ex";
        var engineVersion = "15.00.4236.7.v1";
        var masterUsername = "admin";
        var masterPassword = "mypassword";
        var subnetGroupName = "dev-my-rds-subnet-group";
        var allocatedStorage = 20;

        // Create the request to create an RDS instance
        var createRequest = new CreateDBInstanceRequest
        {
            DBInstanceIdentifier = dbInstanceIdentifier,
            DBInstanceClass = dbInstanceClass,
            Engine = engine,
            EngineVersion = engineVersion,
            MasterUsername = masterUsername,
            MasterUserPassword = masterPassword,
            DBSubnetGroupName = subnetGroupName,
            LicenseModel = "license-included",
            AllocatedStorage = allocatedStorage
        };

        // Create the RDS instance
        var response = await rdsClient.CreateDBInstanceAsync(createRequest);

        // Add a CloudWatch notification
        var cloudWatchClient = new AmazonCloudWatchClient(credentials, region);

        var cwRequest = new PutMetricAlarmRequest
        {
            AlarmName = $"RDS Instance Created: {dbInstanceIdentifier}",
            ActionsEnabled = true,
            MetricName = "DatabaseConnections",
            Namespace = "AWS/RDS",
            Statistic = "Sum",
            ComparisonOperator = "GreaterThanOrEqualToThreshold",
            Threshold = 1,
            Period = 60,
            EvaluationPeriods = 1,
            Dimensions = new List<Dimension>
            {
                new Dimension { Name = "DBInstanceIdentifier", Value = dbInstanceIdentifier }
            }
        };

        PutMetricAlarmResponse cwResponse = await cloudWatchClient.PutMetricAlarmAsync(cwRequest);


        return response.DBInstance.DBInstanceStatus;
    }