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You want to use "my-stream" in place of stream.name? Can you not do that already?
`log_group_name=f'aws/kinesisfirehose/my-stream`

no, i want to use "my-stream-&lt;rand-hash&gt;"

The name isn't known at creation time. To achieve this, you would have to set the name yourself. There is a configuration arg "name" that you can pass into the stream constructor.

Note there is a difference between `resource_name` and the physical `name` of the resource that gets deployed.

By default, Pulumi is trying to help you by generating a physical name from the `resource name` if possible.
And also uses `resource_name` as a reference inside the `state` file.

As tenwit suggested you can override generated name with passing in your own name via `name=` argument.