Multiple queries per chart
Problem to solve
We had built support for multiple queries per chart (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/15201), however with the importing of metrics into the database we lost support for it (https://gitlab.com/gitlab-org/gitlab-ee/issues/6948).
Multiple queries per chart are important, since sometimes you need to have a different query to generate a related time series. For example if you want to display on the same chart, both the maximum value as well as the average value. Or for example the p99 and p95.
Target audience
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Sasha, Software Developer, https://design.gitlab.com/research/personas#persona-sasha /label Persona: Software developer
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Devon, DevOps Engineer, https://design.gitlab.com/research/personas#persona-devon /label Persona: DevOps Engineer
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Sidney, Systems Administrator, https://design.gitlab.com/research/personas#persona-sidney /label Persona: Systems Administrator
Further details
Proposal
We need to re-implement this feature:
- Update the internal database schema to support multiple queries (our YML format already does)
- Update the importer of library metrics to support multiple queries
- Update the library metrics (primarily cAdvisor CPU/Memory) to merge the queries back into one chart
What does success look like, and how can we measure that?
Links / references
/label feature