Please see attachment...It seems my NAGIOS configuration does not update the Histogram Graphics.The Histogram is empty, and all values are empty too on the right part.
Can you guide for this configuration problem?thanks in advance
That is a histogram which draws host/service state changes. If there hasn't been any state changes, the graph will be empty. Find the host or service which had some state chenges and make a histogram for it, and it should draw some lines on the graph.