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There is a nice feature in Terraform AWS provider which is named `default_tags`. The idea is very simple: now you don't need to place `tags` block in each resource. You can define it once per provider, and these tags will be applied to all (or almost all) resources that support tagging.

Sometimes even implementation of a well-documented feature can be tricky

Imagine, that we want to split a Docker Swarm cluster into two parts to operate them independently with a minimal downtime