[Cats] Re: Question on metric freshness and metric definition
Mengfei Zhu <zhumengfei@cmdi.chinamobile.com> Wed, 29 July 2026 01:42 UTC
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Date: Wed, 29 Jul 2026 09:41:56 +0800
From: Mengfei Zhu <zhumengfei@cmdi.chinamobile.com>
To: Yina Dai <daiyn5@mail2.sysu.edu.cn>
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Subject: [Cats] Re: Question on metric freshness and metric definition
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Hi Yina, Thanks for raising this question. I would regard metric definition and metric freshness as two orthogonal aspects. A metric specification defines what a value represents and may also specify relevant measurement characteristics, such as the statistic type, measurement window, or sampling basis. Metric freshness looks at the value from the consumption side and asks whether it is still sufficiently representative for its intended use. This separation highlights the role of this draft in providing a common consumption-side semantic framework across different metrics. I will make this boundary clearer in the next version of the draft. Thanks for pointing it out. Best regards, Mengfei On Tue, Jul 28, 2026 at 19:10 Yina Dai <daiyn5@mail2.sysu.edu.cn> wrote: Hi Mengfei, Thank you for sharing draft-zhu-cats-metric-semantics-00. I have one question regarding the boundary between metric freshness and metric definition. Would the temporal and measurement characteristics of a specific metric, such as its statistic type, measurement window, and sampling basis, be expected to remain part of the corresponding metric specification, while this draft only defines how a consumer evaluates whether the reported value is still usable? A short clarification on this boundary may help avoid overlap between generic metric semantics and individual metric definitions. Best regards, Yina Dai