DeliveryTimedOutCount missing from ssm list_commands output

[tekumara]

import boto3
from moto import mock_ssm

mock = mock_ssm()
mock.start()

client = boto3.client("ssm", region_name="us-east-1")

client.send_command(DocumentName="AWS-RunShellScript", Parameters={"commands": ["ls"]})

response = client.list_commands()
print(response)

# this fails with a KeyError
assert response['Commands'][0]['DeliveryTimedOutCount'] == 0

moto 4.0.1

[bblommers]

Thanks for raising this @tekumara - marking it as an enhancement to add this attribute.