'Hidden TPU nodes

What do the HIDDEN TPU nodes states, specified in this page, exactly represent and mean?

The TPU states specs for the hidden states are a bit too vague for me:

HIDING  TPU node is currently hiding.
HIDDEN  TPU node has been hidden.
UNHIDING    TPU node is currently unhiding.

Also, how to unhide a TPU node? I could not find any option for this in the google cloud console or gcloud documentation.

Any help would be much appreciated

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Solution	Source