Embodiments of a device and method are disclosed. In an embodiment, a method of network availability management of a network deployed at a customer site involves at a cloud server connected to the network, receiving network availability information of the network deployed at the customer site from at least one wireless sensor deployed at the customer site, at the cloud server, receiving wireless communications channel quality information of the network deployed at the customer site, and at the cloud server, automatically determining a service-level agreement (SLA) network availability metric based on the network availability information and the wireless communications channel quality information.