Availability of the platform is tied to the availability of the RHQ Agent. If the agent is not running then the platform will be down (and all of the resources under it will be set to unknown for that period). The agent, when running, pings the server frequently with a heartbeat, if this ping is not received for several minutes then the agent, even if running, will be considered down by the server, and again availability will go down. That shouldn't happen unless communication with the server is interrupted due to connectivity issues, there is perhaps extreme load on the agent, or for some reason the agent's plugin container is not actually running (in which case the agent process is running, but no actual monitoring is taking place. This typically only happens during a plugin update and does not stay that way very long).

That's all I can think of, you can always take a look at the agent log to see if there is anything in there that jumps out at you.

On 9/17/2013 11:20 AM, Attila Heidrich wrote:

Thanks a lot for the very quick answers I got recently!

I still have a single problem. Why is it so, that a Platform (the only Windows XP we have got) is reported to be available only some 60% of the time, while all the measurements on the same machine are OK?

Also the accessibility of the services on this Platform (high level network accessibility tested by port services from outside the virtual machine which runs the Platform) are OK, but the availability of the Platform itself isn't!

Regards,

Attila
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