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This structure of event should be convenient for transmitting of information from the probe and usually consist of a certain number of predefined fields (hostname, timestamp, name of the probe, etc) and any number of user defininable fields.
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Generally C-structure based events are flexible enough for description of a large variety of events and also convenient for representing events hierarchically so that you can reuse more basic events for creation of derivatives (inheritance).
The ability of create new event using inheritance is really convenient. In this sense BAROC is not that bad (although fixed length strings sucks badly and should be replaced with variable length strings.
Description of event also should provide for default values (like in BAROC) and possibly tag fields can be ignored in duplicate detection.
HTML/XML is now the most common way of transmitting hierarchically structure information and events are no exception.
Another important area in which open source packages should be compared is the structuring or event messages (commonly called alerts). It is a very difficult area of monitoring packages architecture and here you can easily go both overboard (suffering from overcomplexity) and underboard (suffering from luck of functionality and flexibility). The is no known best way of structuring the messages about event registered by "event monitors (probes). XML is a pretty natural solution and it is used in OpenSMART.
But adopting XMP instantly throw your product into middleweight or even heavier categories. Still XML has advantages too: it is well known with a lot of tools available for viewing it, it also more or less self-describing and can be automatically converted into HTML. But the question is Does monitoring packages really need this level of complexity in message format or they can achieve the same or better functionality with more simple formats. Do we really need all this heavy-weight XML infrastructure ? At the same time fixed message format has problems too. The most elaborate of them is probably Tivoli usage of BAROC but it is clearly inadequate: it is almost as complex as XML and it is less flexible and less widely adopted. Still this area need additional research and the question whether some simple non-XML text format can be more adequate is open.
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