Hi, It seemed useful if there would be an option to gather available memory in more detail. Like "free" column from "free -m " in row "-/+ buffers/cache" So there could be an option like e.g. "ReportBuffersCache", which would put to use gathering of total used and total free memory.
Use case for that is that collectd would be able to fire a notification if available memory is below some threshold. There could also be another option like "ReportBuffersCachePercentage" which would to the same as above but in percentages. The benefit for percentages is in e.g. cluster machines, where machines might have different RAM sizes, and is impractical to manually prepare thresholds for each machine. I think that I will probably need those things above in my project, so if this looks reasonable, I could make a pull request. -Vedran P.S. I am not sure if some other plugin is available for this already, or there is another way to do the same.
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