Labels: A list of labels to apply for this instance. Changing instance labels will also change the instance tags.
Each label key & value must comply with RFC1035. Specifically, the name must be 1-63 characters long and match the regular expression [a-z]([-a-z0-9]*[a-z0-9])? which means the first character must be a lowercase letter, and all following characters must be a dash, lowercase letter, or digit, except the last character, which cannot be a dash. For example, "webserver-frontend": "images". A label value can also be empty (e.g. "my-label": "").