Meridian Meridian is The OpenNMS Group’s highly scalable open source network management platform. It lets you monitor your network and provides traffic analysis, network discovery, and alerting. A Meridian subscription lets you access the OpenNMS Appliance Service and the OpenNMS Time Series DB. The Appliance Service helps you set up and manage Minion Appliances. The Time Series DB provides a scalable time series database to store and persist performance metrics that Meridian collects from the devices it monitors. You must have a subscription to access OpenNMS Meridian in the Portal. Contact sales@opennms.com for more information or to purchase a subscription. OpenNMS Portal Manage Instances