This is a Jenkins plugin that dynamically provisions Docker containers as ephemeral build agents. It implements Jenkins cloud, node, computer, retention strategy, and connector extension points. The architecture is organized around DockerCloud (cloud configuration and provisioning), DockerTemplate/DockerTemplateBase (container templates), DockerTransientNode (the running container as a Jenkins agent), and DockerComputerConnector subclasses that connect agents via SSH, JNLP, or Docker attach. The plugin also provides pipeline steps (dockerNode/declarative agent), a Docker image build-and-publish builder, a management UI for inspecting Docker hosts and containers, and a watchdog that reconciles orphaned containers with Jenkins nodes. A DockerAPI wrapper around docker-java handles client caching, credentials, Unix sockets, and connection options.