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exposition format: specify precisely the semantics of empty label values #548

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beorn7 opened this issue Sep 9, 2016 · 1 comment
Open

exposition format: specify precisely the semantics of empty label values #548

beorn7 opened this issue Sep 9, 2016 · 1 comment
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exposition format

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@beorn7
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beorn7 commented Sep 9, 2016

In general, a label with an empty value is identical to a label that is not set at all.
However, while that is (or should be) true in PromQL, there is a specific semantics in the exposition format (i.e. a label with an empty value does exist and only disappears after all the relabeling steps, when it is ingested into Prometheus). We should be clear about this in the spec.
@brian-brazil
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The effect on honor_labels is the relevant thing. Any difference at the relabelling stage is a bug.

@brian-brazil brian-brazil mentioned this issue Jul 18, 2017
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aylei pushed a commit to aylei/docs that referenced this issue Oct 28, 2019
@yikeke @lilin90
*: add summary metadata to all docs files for SEO (prometheus#550)
c1e613d 
* op-guide, tool: add summary metadata  (prometheus#548)

* op-guide: add summary metadata

* op-guide: add summary metadata#2

* tool: add summary metadata

* op-guide: address comment

* *: add summary metadata to 63 docs files (prometheus#549)

* *: add summary metadata to 63 docs files

* tikv: update summary wording
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