Just the standard "logging" - might not meet the definition of "structured logging", but at a glance it seems about as featureful as what is being added to Go right now.
Python has no equivalent of logger.With or other k/v pairs, which is what makes it structured logging and why it's interesting at all. Go has had unstructured logging since its early days.
I don't really follow what the benefit of the k/v thing is relative to just passing in a suitable string. I'd just assumed that the automation of "debug", "info" etc was what made it structured.
