policies

One or more policies to apply to a parameter. This operation takes a JSON array. Parameter Store, a capability of Amazon Web Services Systems Manager supports the following policy types:

Expiration: This policy deletes the parameter after it expires. When you create the policy, you specify the expiration date. You can update the expiration date and time by updating the policy. Updating the parameter doesn't affect the expiration date and time. When the expiration time is reached, Parameter Store deletes the parameter.

ExpirationNotification: This policy initiates an event in Amazon CloudWatch Events that notifies you about the expiration. By using this policy, you can receive notification before or after the expiration time is reached, in units of days or hours.

NoChangeNotification: This policy initiates a CloudWatch Events event if a parameter hasn't been modified for a specified period of time. This policy type is useful when, for example, a secret needs to be changed within a period of time, but it hasn't been changed.

All existing policies are preserved until you send new policies or an empty policy. For more information about parameter policies, see Assigning parameter policies.