Synaps

Is the VMMON metrics reporting agent also on the opensource path?

Asked by Eoghan Glynn

Just wondering if there's a plan to opensource the VMMON metrics reporting agent alongside the Synaps API implementation?

There's an interesting tension in such an agent, between batching up metrics versus potential staleness that I'd be interested in discussing.

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Eoghan Glynn (eglynn) said : 		#1

So just to clarify, the thought was that since the PutMetricsData call is signed => the bigger the payload, the smaller the per-metric auth cost.

But of course the more aggressively you batch, the more you run the risk of staleness.

Just batching one-datum-per-metric being watched by the agent on each hypervisor polling cycle (as opposed a timeseries of multiple-datapoints-per-metric) is probably sufficient, but I was wondering what your experience was in this regard with VMMON.

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June Yi (gochist) said : 		#2

Unfortunately, VMMON is not on the opensource path now.

Synaps supports multiple metric data in a single API request as well as AWS CW. VMMON is polling 7 metrics per instances and send them in a single API call every minute.

In my experience, there was no problem even if VMMON had requested one-datum-per-metric request.

Regarding the risk of staleness, I can say Synaps is fast enough to worry about it.

Thank you,
June Yi

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