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install pghero in rds postgresql

{
    "Sid": "Allow_Publish_Alarms",
    "Effect": "Allow",
    "Principal":
    {
        "Service": [
            "cloudwatch.amazonaws.com"
        ]
    },
    "Action": "sns:Publish",
    "Resource": "arn:aws:sns:<region>:<account-id>:<topic-name>"
}