Jaron CollisCore ConceptTo remotely monitor and forward system status information to a central operators centre.monitoringaggregationmonitoringAchieved by adding sensors to each application component of interest, sensor data is aggregated by a collecting component 'MonitorBean'conceptsvisualisationaggregationThe refining of collected observations into a small set of service states reflecting current state of the system. This abstraction process is handled by a dedicated aggregator component configured by rules.service mappingupdate modelcommunication channelconceptsActivities abstracted into concepts and organised into a hierarchy of visits, events & tasks. By structuring at collect-time related activities appear together - rather than in separate text logs requiring post-processing.visitseventstasksvisitsAll interactions by a particular usereventsIndividual interactions, e.g. page requests, received datagramstasksOperations performed by application in response to an event - each has a status code (OK, WARNING, CRITICAL)visualisationCollected information can be visualised in real-time through web interfaceservice mappingRules describe mapping between incoming information source and a particular service stateupdate modelIncoming monitored events (errors) may change the aggregator component's model, the service state moving from OK to an error state. communication channelService states are written to a database which is asynchronously polled by a system daemon (e.g. Nagios) that sends the results to a network operations centre.falsesoftware12003-08-05T17:33:51.855+01:002003-10-08T15:42:14.746+01:00Nagioshttp://www.nagios.org