prometheus/prometheus

promql: option to preserve comments in parser

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#15.871 aperta il 28 gen 2025

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Descrizione

Proposal

I have a requirement to analyse and modify promql expressions to enforce some business-specific rules. This is being achieved by parsing to the AST, analysing the tree through traversal, and optionally applying modifications to the AST before rendering it back to a string.

Comments are currently stripped in this process by a hard-coded skip in the parser.

We would like this to be an option somewhere so that we can preserve these comments through the parse->AST->string process, as these comments can contain useful debugging/tracing information provided by the original query issuer.

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