The new Lemon web frontend will be offered in production from 6th February at address http://lemon.cern.ch/lemon-web
Current version, known as lemonweb (http://lemonweb.cern.ch/lemon-web/), will remain active during 2012.
The main page of the new frontend will be displayed on the central displays from 6th February 10.00 am.
Lemon is a server/client based monitoring system. On every monitored node, a monitoring agent is launched and this communicates using a push/pull protocol with sensors, also running on the node, which are responsible for retrieving the monitoring information. The monitored samples are stored in a local cache and also forwarded to the application server using UDP or TCP transport protocols with or without authentication/encryption of the data samples. Sensors can collect information on behalf of remote entities like network switches or power supplies.