check_lambda_capacity.template

{
  "AWSTemplateFormatVersion": "2010-09-09",
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          "selector": "g:nth-child(1) g:nth-child(4) g:nth-child(4) circle:nth-child(1)     ",
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    }
  },
  "Resources": {
    "LambdaIAMPolicy": {
      "Type": "AWS::IAM::Policy",
      "Properties": {
        "Roles": [
          {
            "Ref": "IAMRole"
          }
        ],
        "PolicyName": "check_report_lambda",
        "PolicyDocument": {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Effect": "Allow",
              "Action": [
                "logs:CreateLogGroup",
                "logs:CreateLogStream",
                "logs:PutLogEvents"
              ],
              "Resource": "arn:aws:logs:*:*:*"
            },
            {
              "Effect": "Allow",
              "Action": [
                "lambda:ListFunctions",
                "lambda:ListVersionsByFunction"
              ],
              "Resource": [
                "*"
              ]
            },
            {
              "Effect": "Allow",
              "Action": [
                "cloudwatch:PutMetricData"
              ],
              "Resource": [
                "*"
              ]
            }
          ]
        }
      },
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      },
      "DependsOn": [
        "IAMRole"
      ]
    },
    "LF4N8DB": {
      "Type": "AWS::Lambda::Function",
      "Properties": {
        "Description": "Checks and graphs the total capacity used by lambda in a region.",
        "Role": {
          "Fn::GetAtt": [
            "IAMRole",
            "Arn"
          ]
        },
        "Handler": "lambda_function.lambda_handler",
        "Runtime": "python2.7",
        "MemorySize": 256,
        "Timeout": 15,
        "Code": {
          "S3Bucket": {
            "Ref": "S3Bucket"
          },
          "S3Key": {
            "Ref": "S3Key"
          }
        }
      },
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    },
    "IAMRole": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "AssumeRolePolicyDocument": {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Action": "sts:AssumeRole",
              "Principal": {
                "Service": "lambda.amazonaws.com"
              },
              "Effect": "Allow",
              "Sid": ""
            }
          ]
        }
      },
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    },
    "CW4MW7T": {
      "Type": "AWS::CloudWatch::Alarm",
      "Properties": {
        "AlarmDescription": "Lambda capacity usage alert",
        "Namespace": "lambda",
        "MetricName": "size",
        "Statistic": "Average",
        "Period": 300,
        "Unit": "Bytes",
        "EvaluationPeriods": 2,
        "Threshold": {
          "Ref": "CapacityAlarmThreshold"
        },
        "ComparisonOperator": "GreaterThanOrEqualToThreshold",
        "AlarmActions": [
          {
            "Fn::If": [
              "CreateSNSTopic",
              {
                "Ref": "SNS"
              },
              {
                "Ref": "SNSArn"
              }
            ]
          }
        ],
        "OKActions": [
          {
            "Fn::If": [
              "CreateSNSTopic",
              {
                "Ref": "SNS"
              },
              {
                "Ref": "SNSArn"
              }
            ]
          }
        ]
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    },
    "SNS": {
      "Type": "AWS::SNS::Topic",
      "Properties": {
        "DisplayName": "lambda capacity alert"
      },
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      },
      "Condition": "CreateSNSTopic"
    }
  },
  "Parameters": {
    "CapacityAlarmThreshold": {
      "Description": "Capacity (Bytes) thershold for CloudWatch alarm",
      "Type": "Number",
      "Default": 100000000,
      "MinValue": 1,
      "MaxValue": 1610612736
    },
    "SNSArn": {
      "Description": "Existing SNS topic ARN to send CloudWatch alarms (optional)",
      "Type": "String"
    },
    "S3Bucket": {
      "Description": "s3 bucket which contains the lambda function",
      "Type": "String",
      "Default": "ijin"
    },
    "S3Key": {
      "Description": "s3 key path for lambda function",
      "Type": "String",
      "Default": "aws/lambda/check_lambda_capacity/lambda_function.zip"
    }
  },
  "Conditions": {
    "CreateSNSTopic": {
      "Fn::Equals": [
        {
          "Ref": "SNSArn"
        },
        ""
      ]
    }
  }
}