ShallowGoldfish8 the models are uploaded in the background, task.close() is actually waiting for them, but wait_for_upload is also a good solution.

where it seems to be waiting for the metrics, etc but never finishes. No retry message is shown as well.

From the description it sounds like there is a problem with sending the metrics?! the task.close is waiting for all the metrics to be sent, and it seems like for some reason they are not, and this is why close is waiting on them
Are you running your own clearml-server? is the simple TB example (see https://github.com/allegroai/clearml/blob/master/examples/frameworks/tensorflow/tensorboard_toy.py or https://github.com/allegroai/clearml/blob/master/examples/frameworks/tensorflow/tensorflow_mnist.py ) working for you?