docs: document TinyMath expression nesting and length limits (#7623) - #7676
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florent-leborgne
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…#282035) ## Summary Documents the two new hard input limits on TinyMath expressions in the 8.19 Canvas function reference: up to 20 levels of parenthesis nesting and up to 1,000 characters, with expressions exceeding either limit rejected before parsing. This is the 8.19 (AsciiDoc) companion to the V3 docs update in elastic/docs-content#7676. On the `8.19` branch the TinyMath reference is still the legacy AsciiDoc, so the docs-content change (scoped `stack: ga 9.4`) does not reach 8.19 readers. The limits shipped in the `kbn-tinymath` package via #276783 (`backport:all-open`) and are present on the `8.19` branch: `MAX_NESTING_DEPTH = 20` and `MAX_EXPRESSION_LENGTH = 1000` in `src/platform/packages/private/kbn-tinymath/src/index.js`, checked before parsing. Per the issue availability table, the fix ships to users in 8.19.20. - **`docs/canvas/canvas-tinymath-functions.asciidoc`**: Add a note to the page introduction stating the nesting-depth and length limits. ## Related - V3 companion: elastic/docs-content#7676 - Docs issue: elastic/docs-content#7623 - Implementation: #276783 ## Labels needed Docs-only backport to the 8.19 branch. Please add `release_note:skip` and the `v8.19.20` version label on merge. --- > **AI-generated draft** — created with Claude. > Review all generated content for factual accuracy before merging.
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Summary
This PR addresses #7623 with the following change:
explore-analyze/visualize/canvas/canvas-tinymath-functions.md: Add a note to the page introduction documenting the two new hard input limits on TinyMath expressions — up to 20 levels of parenthesis nesting and up to 1,000 characters — with expressions exceeding either limit rejected before parsing.These limits were added in elastic/kibana#276783 to the shared
kbn-tinymathpackage. The performance fix itself needs no docs, but the limits are user-visible constraints that can reject previously accepted long or deeply nested formulas, and this is the only reference page describing TinyMath behavior.The values are verified against the current source (
MAX_NESTING_DEPTH = 20,MAX_EXPRESSION_LENGTH = 1000inkbn-tinymath/src/index.jsat HEAD).Version scoping
Tagged
stack: ga 9.4andserverless: ga.The fix was backported broadly (
backport:all-open), but under the cumulative-docs convention that readers run the latest patch of a documented minor, only minors with the limits in an actually shipped release get a badge:v9.3.9was a backport target, not a release (9.3 ended at 9.3.8), so no real 9.3 build carries the limits.9.4is the floor.9.4+in a single monotonic tag. Given this is a defensive input limit, leaving the trailing 8.x uncovered is an acceptable trade.Resolves
Closes #7623