Observer pattern problem

[Yaroslav Chinskiy]

Hi,
I am writing util to monitor OS performance. I have number of agents to collect statistics(io, cpu, memory etc.) I wanted to have one gateway to send this stats to my server(stats are collected on the remote host). In order to do it clean, I used Observer pattern. However, I ran in to problems. It looks like if the Observer does not get the value of changed Observable object befor it was reset to a new one, I loose the value.
Is there any queue mechanism that has to be enabled?
(Each agent runs in the seperate thread asynch. I used one observer for all agents. The logic in observer is very simple, I take the value an place it on a message queue(not JMS).)