A gateway is an agent that acts as a channel between Oracle Management Cloud and all other Oracle Management Cloud agents.
A gateway is optional, but it’s considered a best practice to install one for future use and security needs. For security reasons, enterprises typically allow one or a few hosts to connect to the Internet. You install a gateway on the hosts that have access to the Internet, so that all other agents communicate with Oracle Management Cloud using the hosts that have the gateway installed.
It’s recommended that you install multiple gateways, because this provides high availability for other Oracle Management Cloud agents. So, if one gateway goes down, then the agents can transmit data through another working gateway.