Describe the bug

In CDK it states Unit.NONE means "No unit", but it results in "None" instead of "No unit" (and no data is returned when Unit == None) .

Expected Behavior

The documentation states Unit.NONE means "No unit", so it is expected that when using Unit.NONE in CDK stack for alarm, the unit will be "No unit".

Current Behavior

In CDK it states Unit.NONE means "No unit"

The following screenshot shows the deployed alarm having Unit "None" instead of "No unit" (and no data is returned when Unit == None).

Reproduction Steps

1. Use Unit.NONE for an alarm.
2. Deploy the CDK stack.
3. Check the alarm, you will see the Unit is None, not No Unit.

Possible Solution

Either fixed the documentation Unit.NONE != No Unit, or make Unit.NoUnit an option.

Additional Information/Context

No response

CDK CLI Version

2.21.1 (build a6ee543)

Framework Version

No response

Node.js Version

v16.14.2

OS

Ubuntu 20.04.4

Language

Typescript

Language Version

Version 4.6.3

Other information

No response