iot_topic_rule CloudWatch metric timestamp Wrong validator

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Description

Terraform and AWS Provider Version

Terraform v1.13.5
on linux_amd64
+ provider registry.terraform.io/hashicorp/archive v2.7.1
+ provider registry.terraform.io/hashicorp/aws v6.14.0

Affected Resource(s) or Data Source(s)

No response

Expected Behavior

When setting a cloudwatch_metric in an iot_topic_rule the metric_timestamp value should accept a valid string containing a Substitution template as described here: https://docs.aws.amazon.com/iot/latest/developerguide/iot-substitution-templates.html and here:

Actual Behavior

When setting a cloudwatch_metric in an iot_topic_rule the metric_timestamp is now validated to be a ValidUTCTimestamp, and breaks the deployment if other values such as substitutions like ${device_time} are provided.

Relevant Error/Panic Output

Sample Terraform Configuration

resource "aws_iot_topic_rule" "system_metrics_to_cloudwatch" {
...
 cloudwatch_metric {
    role_arn         = aws_iam_role.system_metrics_to_cloudwatch_role.arn
    metric_namespace = "metric_1/$${vesselId}"
    metric_name      = "tx"
    metric_value     = "$${tx}"
    metric_unit      = "Count"
    metric_timestamp = "$${timestamp}"
  }
}

Steps to Reproduce

add a new iot_topic_rule with cloudwatch metric containing substitution template as metric_timestamp
apply

Debug Logging

GenAI / LLM Assisted Development

n/a

Important Facts and References