exposition format: specify precisely the semantics of empty label values
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Description
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.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Locate the exposition format specification and read the sections covering empty label values, PromQL, and relabeling. Update the specification to state that an empty label value exists in the exposition format and disappears only after ingestion relabeling, then verify the wording is precise and consistent.
Written by the indexing model from the issue text.
Assessment
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100