feat(rfc): parse-first config interpolation#25603
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Propose moving environment-variable and SECRET[...] substitution from the raw-text pipeline to operate on parsed value trees. Adds a JSON-Schema-driven coercion pass that converts interpolated string scalars to their declared types and produces field-path-aware errors before serde is invoked.
pront
changed the title
Rewrite sentences that used `--` as an em-dash substitute so the same information flows naturally with colons, parentheses, or separate clauses. No design content change.
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Summary
Proposes restructuring Vector's config loading pipeline from raw-text interpolation to parse-first interpolation. The config document is parsed into a value tree first,
${VAR}andSECRET[...]are substituted only on string leaves, and a JSON-Schema-driven coercion pass converts string scalars to declared types before serde runs.Two outcomes:
unknown field at sinks.my_sink.retries) instead of serde messages with no location.RFC:
rfcs/2026-06-09-parse-first-config-interpolation.md.Vector configuration
N/A. Docs-only PR.
How did you test this PR?
N/A. Docs-only PR.
Change Type
Is this a breaking change?
Does this PR include user facing changes?
no-changeloglabel to this PR.References
N/A