Requires opCharts-4.5.8 or greater
opCharts metrics links is a new feature which allows the link between two nodes in a top, geo or network map to define a custom metric to set the link weight and colour, for example you could use this link to define the SNR of a radio between two separate towers.
It uses the NMIS status system to derivie the value as this allows you to configure the ratio of what is considered a bad vs good link. Please see Creating Thresholds with NMIS Modelling to see how this is setup.