In RabbitMQ 4.x, AMQP 1.0 is a core protocol that is always supported and does not require a plugin to be enabled.

This no-op plugin exists only such that deployment tools can continue to enable and disable this plugin without erroring:

rabbitmq-plugins enable rabbitmq_amqp1_0
rabbitmq-plugins disable rabbitmq_amqp1_0

Enabling or disabling this plugin has no effect on AMQP 1.0 support scope or clients.